Belize's geography: a granite massif, limestone lowlands and a reef offshore

How the Maya Mountains divide Belize

Most of Belize is limestone. The exception is the Maya Mountains, a large uplifted block of intrusive Paleozoic granite and sediments that runs northeast to southwest across the south-central part of the country, and that block is what divides the land in two. South of the Belize River the mountains and their basins and plateaus fill everything except a narrow coastal plain. North of it the country is flat.

The highlands rise to about 1,100 metres. Doyle's Delight, the summit at 1,124 metres, stands in the Cockscomb Range, a spur of the Maya Mountains that runs toward the sea. Their soils are shallow, easily eroded and poor, and Britannica describes the highlands as mostly forested and largely uninhabited. On the western side of the block the Mountain Pine Ridge plateau already stood above sea level during the Cretaceous, and it stays noticeably cooler than the lowlands all year.

Around the granite the rock changes back to Cretaceous limestone, and the hills there are karst: sinkholes, caverns and underground streams. Some of those soils are fertile and have been farmed for at least 4,000 years. Several major faults cut the highlands, but much of Belize lies outside the tectonically active zone under most of Central America, and the Wikipedia geography records earthquakes in the south as infrequent.

What the northern lowlands are made of

The northern half of the country sits on the Yucatán Platform, a stable shelf of limestone. Britannica gives its elevation as less than 60 metres above sea level across lowlands and swamps, broken by occasional karst hills such as the Yalbac Hills on the Guatemalan border and the Manatee Hills between Belize City and Dangriga. Moving west from the coast the ground passes from mangrove swamp to pine savanna to hardwood forest. The coast itself is flat, swampy and full of lagoons, especially in the north and centre; the lagoons reduce the land area to about 21,400 square kilometres in one Wikipedia calculation.

Eighteen major rivers drain these lowlands. The Belize River, also called the Old River, drains more than a quarter of the country along the northern edge of the Maya Mountains and reaches the sea at Belize City. It is navigable up to the Guatemalan border and carried most traffic between the interior and the coast until well into the 20th century. The New River runs through the sugar districts to Chetumal Bay, the Hondo forms the border with Mexico, and the Sibun drains the northeastern edge of the mountains. The New River Lagoon covers about 13.5 square kilometres.

The best soils follow the rock. Britannica puts the most fertile ones in the limestone north and on the coastal plain and river valleys of the south, and the alluvial valleys of the New and Sibun rivers carried much of the country's settlement and cultivation.

Settlement still follows that pattern, and it is thinly spread. The 2022 census of the Statistical Institute of Belize counted 110,719 households, 57.8% of them in rural areas and 42.2% in urban ones. Belize City, on both banks of Haulover Creek at the delta mouth of the Belize River, had 65,222 people in Britannica's 2024 figure, several times the population of the inland capital. The sugar towns of Corozal and Orange Walk sit on the northern limestone, the citrus and banana country of Stann Creek and Cayo lies south and west of Belize City, and Punta Gorda, the southern port, faces Guatemala and Honduras across the Gulf of Honduras. The Maya Mountains between them hold almost nobody.

Where the reef runs and what it encloses

A barrier reef runs along the whole coast, about 300 metres offshore in the north and 40 kilometres out in the south. It is a 300-kilometre section of the Mesoamerican Barrier Reef System, which continues for about 900 kilometres from Cancún to Honduras. Between reef and shore lies a lagoon that UNESCO's description, in its Dutch-language summary, gives as two to three metres deep in the north, deepening south of Belize City to a channel of 65 metres in the Gulf of Honduras.

Beyond the barrier stand three atolls: Turneffe, directly east of Belize City; Lighthouse Reef, the most easterly, which holds the Great Blue Hole that Jacques Cousteau made famous in 1970; and Glover's Reef. UNESCO counts approximately 450 sand and mangrove cayes in the reef complex. Ambergris Caye, Caye Caulker and St George's Caye are among the named ones, and at Rocky Point the barrier reef touches the shore.

The counts of what lives there differ with the counter. UNESCO's statement of value records over 500 species of fish, 65 scleractinian corals, 45 hydroids and 350 molluscs, with 178 terrestrial plants and 246 taxa of marine flora. The Wikipedia article on the reef lists 70 hard and 36 soft coral species and estimates that about 90% of the reef has not been researched. The reserve system protects the West Indian manatee, the American crocodile and three species of sea turtle, and red-footed boobies nest on Half Moon Caye.

Why the reef went on the danger list

UNESCO inscribed the Belize Barrier Reef Reserve System as a World Heritage site in 1996. It is not one reserve but seven: Bacalar Chico, the Blue Hole, Half Moon Caye, South Water Caye, Glover's Reef, Laughing Bird Caye and the Sapodilla Cayes. Together they cover about 12% of the reef complex. The Wikipedia article on the reef gives them 960 square kilometres.

The system was placed on the List of World Heritage in Danger in June 2009 and removed on 26 June 2018. In between, Belize banned bottom trawling in December 2010, banned offshore oil drilling within one kilometre of the reef and its seven sites in December 2015, and in 2017 imposed an indefinite moratorium on offshore oil activity everywhere it exercises maritime jurisdiction, with a law requiring a referendum before the moratorium can be lifted. UNESCO's own list of threats still names mangrove clearance, dredging, coastal development, tourism and overfishing.

Warm water is the other pressure. The first mass bleaching, in 1995, killed an estimated 10% of coral colonies, according to Belize's Coastal Zone Management Institute, and after Hurricane Mitch in 1998 biologists measured a 48% fall in live coral cover across the reef system.

How rainfall changes from Corozal to Punta Gorda

The climate is subtropical in Britannica's classification and tropical in Wikipedia's, and the seasons are set by rain more than by temperature. A dry season runs from late February to May and a wet season from June to November, interrupted by a shorter dry spell known locally as the "little dry" in late July or August. From September to December northerly winds bring cooler, drier air; for the rest of the year the trade winds blow onshore.

Rainfall rises steeply from north to south. Britannica gives about 1,270 millimetres a year at Corozal on the Mexican border, about 1,900 at Belize City and 4,445 at Punta Gorda in the far south. Wikipedia's figures run from 1,350 millimetres in the north and west to over 4,500 in the extreme south. In the north and centre fewer than 100 millimetres a month fall between January and April or May; in the south the dry season is shorter, normally February to April.

Temperature varies less. Belize City averages about 23 °C in December and 29 °C in July according to Britannica, and Wikipedia gives the coastal range as 24 °C in January to 27 °C in July. It is slightly warmer inland, except on the southern highland plateaus.

Which hurricanes changed the map

Hurricanes are a threat from July through November, and two of them moved the capital.

After Hattie devastated Belize City for the second time in thirty years, the government built a new capital about 80 kilometres inland on a site chosen to escape flooding. Construction of Belmopan began in 1966 and government offices moved there in 1970. Belize City, on ground barely above sea level and surrounded by mangrove swamp, remained the port and the commercial centre. The IMF's 2025 Article IV mission listed rising sea levels, hurricanes, floods, droughts and coastal erosion as threats to tourism, agriculture and energy. Britannica records that the storm of 2000 wrecked the country's infrastructure and displaced tens of thousands of people. Hurricane Mitch in October 1998, which followed two decades in which many thought the country safe from hurricanes, led to the creation of the National Emergency Management Organization. The most recent hurricane to make landfall, Lisa, came in 2022.

How fast the forest is being cleared

Forest covered about 56% of the land in 2020, some 1,277,050 hectares, down from 1,600,030 hectares in 1990. Britannica's rounder figure is three-fifths. A remote sensing study by CATHALAC and NASA with the Forest Department, published in August 2010, put forest cover at about 62.7% in early 2010 against 75.9% in late 1980, and found that forest inside declared protected areas had been cleared at about 6.4% over those thirty years while over a quarter was lost outside them.

The forest changes with the rock. Deciduous forest with sapodilla and mahogany grows on the northern limestone, taller evergreen forest in the south, Santa Maria rather than mahogany on the plateau, and oak and pine on some ridges. Swamp forest lines the rivers, open savanna with scattered pines and palmetto palms covers parts of the southern coastal plain and the country inland from Belize City, and mangrove fringes the coast.

The Cockscomb Basin Wildlife Sanctuary, founded in 1986 on the eastern slopes of the Maya Mountains, was set up as a sanctuary for the jaguar; Britannica gives its area as about 390 square kilometres and Wikipedia as about 400. Baird's tapir, which can weigh 270 kilograms and is called the mountain cow, is protected as the national animal, and Britannica lists puma, known locally as red tiger, alongside deer, crocodile and manatee.

Where the borders and the sea limits run

The land boundaries follow rivers at both ends and a surveyor's line in between. The Hondo marks much of the northern border with Mexico and the Sarstoon much of the southern border with Guatemala, while the western border follows no natural feature at all, running through lowland forest and highland plateau on the line the 1859 treaty drew from Gracias a Dios Falls to Garbutt's Falls and due north to Mexico. The published lengths disagree: the Wikipedia geography gives 272 kilometres with Mexico and 266 with Guatemala, the main Wikipedia article gives 516 kilometres in total, and the coastline is given as 386 kilometres by Wikipedia and 280 by Britannica.

At sea Belize claims an exclusive economic zone of 35,351 square kilometres and a territorial sea of 12 nautical miles, except from the mouth of the Sarstoon to Ranguana Cay, where the Maritime Areas Act of 1992 limits it to 3 nautical miles to leave room for a settlement with Guatemala. That settlement is the subject of the case before the International Court of Justice, covered in the history and the politics article.