Czechia's geography: a basin that drains to three seas

How the border mountains enclose a Bohemian basin

The Czech lands lie mostly between 48 and 51 degrees north and between 12 and 19 degrees east, with Germany to the west and north-west, Poland to the north and north-east, Slovakia to the east and Austria to the south. Almost the whole of that territory belongs to the Bohemian Massif, a geologically stable block that Britannica describes as a large, roughly ovoid elevated basin, the Bohemian Plateau, encircled by mountains.

The encircling ranges divide into six groups, and every one of them stands on a frontier. The Šumava Mountains and the Bohemian Forest close the south-west. The Berounka river highlands lie to the west. The Ore Mountains, Krušné hory in Czech, form the German frontier in the north-west. The Sudeten system carries most of the Polish border west of Ostrava and holds the Giant Mountains, Krkonoše, where Sněžka reaches 1,603 metres. East of that runs a small fringe of Oder lowland along the Polish border, and south-east of the plateau sit the Bohemian-Moravian Highlands, which contain the Moravian Karst.

Moravia is hilly too, but it is arranged on a different plan. The Outer Carpathian Depressions, known to geographers as the Moravian-Silesian Beskids, take in the valleys of the upper Oder and the Morava together with the headstreams of the Dyje. Along the border with Slovakia the Bílé Karpaty and the Javorníky rise as the westernmost of the Western Carpathian mountains.

The two halves of the country are also different ages. The Bohemian Massif is old and stable, with igneous rock at its base, significant areas of sandstone across north-eastern Bohemia and gneiss as its commonest metamorphic rock. Only the Western Carpathian strip in the east is young, lifted during the Tertiary. One country therefore holds an ancient massif and the outer rim of a much younger chain, with the join running down its eastern side.

Why every river runs out of the country

A rimmed basin exports water. Britannica places the Czech Republic in the headwater area of the central European watershed, and the arrangement is unusually clean: four major rivers, three destinations, and no large river arriving from anywhere else.

The Elbe, Labe in Czech, rises near the Czech-Polish border in the Giant Mountains, sweeps south-west across Bohemia gathering the Jizera, the Vltava and the Ohře, then turns north through Germany to the North Sea. The Vltava is the longest river in the country and drains southern Bohemia before emptying into the Elbe at Mělník. The Morava drains most of Moravia and runs south into the Danube and on to the Black Sea. The Oder, Odra in Czech, rises in Moravian Silesia and flows north through Poland to the Baltic.

What lifts this above hydrological trivia is that the country's oldest internal boundaries follow it. The three historical lands correspond with the river basins: the Elbe and Vltava basin for Bohemia, the Morava basin for Moravia, and the Oder basin for Czech Silesia. Nobody set out to draw a country around its drainage. Water ran off the rim in three directions, settlement and trade followed the valleys, and over centuries the divisions hardened into lands with their own names, dialects and capitals.

The exit points make the same point from the other end. The lowest ground in the country is the gap where the Elbe breaches the Ore Mountains, at 117 metres, so the lowest place is the door the water leaves by. Everything else is modest. There are many smaller rivers of little economic importance, larger ones such as the Vltava carry hydroelectric plants, and the country is rich in mineral springs with groundwater reserves in heavy use.

Why a landlocked country holds a Hamburg berth

The Vltava is navigable from Prague down to Mělník, and from that confluence river traffic can run the whole way to Hamburg. That single fact produced one of the odder pieces of European territory.

Moldauhafen is a lot of 30,000 square metres in the middle of the Hamburg docks, awarded to Czechoslovakia by Article 363 of the Treaty of Versailles so that a landlocked state would have somewhere to move goods carried down river onto seagoing ships. The territory reverts to Germany in 2028.

The berth follows from the geography. A country whose water all leaves by river has one plausible route to a seaport, and the route is the Elbe: loaded at Prague, floated down the Vltava, transferred at the far end of a waterway that begins under the rim of the Giant Mountains. The wharf was the compensation offered to a state that had come out of the First World War with industry, coal and no coast.

The reversion date matters to the argument as much as the grant does. Access to the sea has never been a fact of Czech geography. It has been a legal arrangement over somebody else's port, held for a term, and the term ends.

How elevation decides the Czech climate

The climate is temperate and sits in the transition between the oceanic and the continental. Summers average around 20 degrees Celsius in most areas and are fairly cool and dry, winters average around 0 and are mild and wet, and relative humidity runs between 60 and 80%. The continental influence shows up as large swings in both temperature and precipitation, and the moderating oceanic influence weakens from west to east.

Across the lowlands the thermometer barely moves. The mean annual temperature at Cheb in the extreme west is 7 degrees Celsius, and at Brno in southern Moravia it reaches only 9. Altitude does the work instead. The summit of Sněžka averages minus 0.4 degrees Celsius while the lowlands of the South Moravian Region average as high as 10, and Prague sits near the lowland figure with an urban lift of its own.

Precipitation obeys the same rule. The central Bohemian basins take about 450 millimetres a year and the windward slopes of the Krkonoše more than 1,500. The wettest area is around Bílý Potok in the Jizera Mountains and the driest is the Louny District north-west of Prague. Most rain falls in July and the least in February.

The recorded extremes are wide for a country of this size: minus 42.2 degrees Celsius at Litvínovice near České Budějovice in 1929, and 40.4 degrees at Dobřichovice in 2012. Spring brings high water as the mountain snow melts, with occasional flooding. Summer brings severe thunderstorms, damaging straight-line winds, hail and the occasional tornado. The growing season runs about 200 days in the south and less than half that in the mountains, which is the agricultural version of the same rule.

Britannica's summary is worth borrowing whole: the country has a succession of small and varied districts where a larger place would have climatic zones, because here the climate follows the topography.

What people built where lakes are missing

Naturally occurring bodies of standing water are scarce. The largest and deepest natural lake, Černé jezero, covers 18.4 hectares. The largest reservoir by surface, Lipno, covers 4,870 hectares and was built in the 1950s. The distance between those two figures is the whole story of Czech standing water: almost everything a map shows as a lake was dug or dammed.

The older layer is the fish ponds. Rožmberk, the largest pond in the country, belongs to the system built in the 16th century around Třeboň in southern Bohemia, an engineered network of ponds and feeder channels worked for carp and still working. The newer layer is the mid-century reservoirs. Orlík, on the Vltava, holds 716 million cubic metres and is the largest by volume, built at about the same time as Lipno.

Water surface came to 2.18% of the country as at 31 December 2025 on the cadastral figures the Czech Statistical Office publishes, and the share has been rising: water areas gained 13 thousand hectares over the preceding thirty years. Irrigation stays marginal, at an estimated 385 square kilometres of irrigated land, and freshwater withdrawal runs at around 164 cubic metres per person a year.

A country at the top of the watershed has only the rain that falls on it. Nothing arrives from upstream, because there is no upstream. The ponds of the 16th century and the dams of the 1950s are two answers to that condition, four hundred years apart.

How much of the country is forest

The cadastral picture, as at 31 December 2025, gives agricultural land 53.11% of the surface, forest land 34.04%, water 2.18%, built-up land and courtyards 1.73%, and the remainder to other uses.

Arable land and permanent grassland are components of the agricultural total. The direction of travel is as informative as the shares themselves. Over the thirty years to the end of 2025 agricultural land fell by 91 thousand hectares and arable land by 261 thousand, while forest land gained 54 thousand hectares, water areas 13 thousand and built-up land 7 thousand. The Forest Management Institute puts forest cover at 34.1% and reports the forest area climbing steadily, by 1,659 hectares in 2020 alone.

What grows on it stacks by height. Oak, beech and spruce dominate the forest zones in ascending order of elevation, the timberline runs at about 1,400 metres, and above it the cover thins to dwarf pine and then to alpine grasses and low bushes. The highest reaches carry taiga and tundra vegetation of a kind found much further north elsewhere in Europe. The World Wide Fund for Nature divides the territory into four ecoregions: Western European broadleaf forests, Central European mixed forests, Pannonian mixed forests and Carpathian montane conifer forests. Four ecoregions inside 78,871 square kilometres is a consequence of the rim, because the same climb from basin floor to border ridge repeats on every side of the country.

The forest is a worked one. Large areas of the original cover were cleared long ago for cultivation and for timber, and the country scored 1.71 out of 10 on the 2018 Forest Landscape Integrity Index, which measures how far a forest has been modified by management instead of how much of it survives.

Why the borderlands emptied after the war

The population stood at 10,909,500 as at 1 January 2025, and it is densely and evenly spread. Communities are generally only a few miles apart, with the heaviest concentrations in the area around Prague and in the metropolitan area of Ostrava.

The thinnest population is along the German and Austrian frontiers, and the reason is documented rather than physical. Those districts were German-speaking. Their inhabitants were forcibly expelled after the Second World War, first through local acts of violence and then through an organised transfer confirmed by the Soviet Union, the United States and Great Britain at the Potsdam Conference; Britannica puts the number of Sudeten Germans removed at three million. The population map still shows the gap.

Settlement form follows terrain. Rural settlements are characteristically compact, except in the mountain regions colonised during the 13th and 14th centuries, where villages straggle along narrow valleys. Collectivisation in the decades after the Second World War replaced the centuries-old division of land into small irregular private plots with large, regularly shaped fields, which is the field pattern the lowlands still carry.

Administration sits loosely on top of the historic geography. Since 2000 the country has been divided into thirteen regions and the capital, each region with an elected assembly and a governor, over an older layer of seventy-six districts that lost most of their importance in a reform of 1999 and survive as seats of state administration. Beneath them sit 6,254 municipalities as of 2021. The three historical lands have no administrative existence at all, and Bohemia and, to a lesser extent, Moravia remain recognisable entities reflecting different cultural inheritances.

Where the coal and the farmland lie

Two areas of lowland follow the Elbe and the Morava, and those two basins carry the plant agriculture. The soil profile explains why. Rich black chernozems and good-quality brown soils occupy the drier and lower ground, podzols the wet districts, stony mountain soils the high elevations, alluvial soils the river basins and heavy clays the eastern ridges. Vineyards covered 20,969 hectares and hop gardens 8,408 hectares as at 31 December 2025, which together is less than half a percent of the country and is concentrated where the growing season is longest.

The industrial ground lies elsewhere. The areas most affected by heavy industry are the Sokolov Basin and the Most Basin in the north-west, where extensive brown coal deposits are mined mainly to make electricity. Almost 40% of all electric power produced in the country comes from burning brown coal from those basins. South Moravia holds small oil and gas deposits, and that is close to the whole of the country's fossil endowment.

The two maps are worth holding side by side. The north-west that lost its German-speaking population after 1945 is also the ground that was then opened for lignite, so the emptiest districts and the most heavily worked ones are the same districts. The farmland of the Elbe and Morava lowlands, meanwhile, sits on the two floors that the water crosses on its way out of the country.

Which landscapes the country protects

There are four national parks. Krkonoše, the oldest, was established in 1963 to protect glacial landscapes, alpine vegetation and relict boreal-Arctic species such as the Alpine shrew. Šumava is the second biosphere reserve among them, and Podyjí and Bohemian Switzerland complete the set. Alongside the parks sit 25 Protected Landscape Areas, and nature reserves have been created around the Šumava Forest, the Moravian Karst and the Jizera Mountains.

The pattern repeats the one the rest of the country follows. Krkonoše lies in the Sudeten ranges that make the Polish border, Šumava in the Bohemian Forest along the German frontier, and the protected ground is the rim while the worked ground is the floor.

The fauna the parks hold is broad for a landlocked country of this size: bears, wolves, lynx and wildcats among the large mammals, marmots, otters, martens and minks in the forests and wetlands, pheasants, partridges, wild geese and ducks as common game birds, and eagles, vultures, ospreys, storks, eagle owls, bustards and capercaillies generally under protection. Rare or endangered species such as the mouflon are bred in game reserves.

Protection and use pull against each other in the same place. Krkonoše National Park has been extensively developed as a ski resort despite its preservation aims, which is what happens when the most protected landscape in a country is also the only ground high enough to hold snow. The rim gets both the parks and the lifts, and the basin keeps the farms, the coal and the cities, and the water crosses from one to the other in three directions and does not come back.