What makes the Baltic countries a region

A word that has named three different things

Adam of Bremen wrote his history of the archbishops of Hamburg-Bremen between about 1073 and 1076, and turned aside in the fourth book to describe the northern sea. The gulf is called Balticus by the people who live along it, he recorded, because it runs out in the manner of a belt, in modum baltei, through Scythian country as far as Greece. He noted in the same breath that the peoples the water washes also call it the Barbarian Sea, or the Scythian deep, which is the first sign that the name was never the only one on offer.

Philologists have not settled his derivation. The Latin balteus is one reading. A Scandinavian word for a belt or a strait, applied to the narrow entrance, is another. A third takes the name from the Baltic word for white, which survives as baltas in Lithuanian and balts in Latvian.

The adjective moved from the water to a language family in 1845, when Georg Heinrich Ferdinand Nesselmann published Die Sprache der alten Preussen in Berlin and proposed Baltic as the name for the group that Old Prussian, Lithuanian and Latvian belong to. It moved to a set of countries later still, and by an odd route: in nineteenth-century German usage the Balten were the Baltic Germans of the Estonian, Livonian and Courland governorates, a landed minority rather than a nation.

So a sea, a language family and a group of states carry one adjective, and the three do not cover the same ground. Estonian is a Finnic language and belongs to none of Nesselmann's family. The imperial provinces called Baltic covered what is now Estonia and most of Latvia and stopped short of Lithuania, which was governed from Vilna in the north-western territory. Only the sea takes in every member filed here.

What the records hold in common

Every member reaches the Baltic Sea, none is landlocked, and each names Russia among its land neighbours. Latvia and Lithuania border Belarus as well, and Lithuania borders Poland, which is the group's only land connection to the rest of the European Union. Estonia's land border runs with Latvia and Russia and with nothing else.

The ground is low and glacial, and the high point of each country is a moraine hill rather than a mountain: Suur Munamägi at 317 metres in Estonia, Gaiziņkalns at 312 metres in Latvia, Aukštojas Hill at 294 metres in Lithuania. Estonia and Latvia both record the sea itself as their lowest point, and Lithuania records the Nemunas delta. Each member is a parliamentary republic with a single chamber, and the three chambers are the Riigikogu, the Saeima and the Seimas.

Three accession dates are identical across the records. Each acceded to NATO on 29 March 2004, joined the European Union on 1 May 2004, and had checks at its internal borders lifted under the Schengen rules on 21 December 2007. The currency came separately: the euro replaced the Estonian kroon on 1 January 2011, the Latvian lats on 1 January 2014 and the Lithuanian litas on 1 January 2015.

Cooperation between the members has its own furniture, and it is older than the present republics. The foreign ministers signed a memorandum of understanding at Geneva on 12 September 1934. The Baltic Assembly was established on 8 November 1991 and the Baltic Council of Ministers on 13 June 1994, both of them modelled on Nordic bodies of the same shape.

The gap in the middle of the record

The treaty of non-aggression signed by Germany and the Soviet Union on 23 August 1939 carried a secret protocol dividing the territory between them into spheres of interest. Occupation followed in 1940 and incorporation into the Soviet Union that August.

The United States declined to recognise it. The declaration issued by Sumner Welles, then acting secretary of state, on 23 July 1940 set out a policy of non-recognition, and the diplomatic representatives of all the countries here continued to be received in Washington for the fifty-one years that followed.

On 23 August 1989, fifty years to the day after the protocol was signed, a human chain about 600 kilometres long ran from Tallinn through Riga to Vilnius. UNESCO inscribed the documentary record of it on the Memory of the World Register in 2009. The Congress of People's Deputies of the Soviet Union declared the secret protocols invalid on 24 December 1989.

Lithuania declared the restoration of its statehood on 11 March 1990, Estonia on 20 August 1991 and Latvia on 21 August 1991, and all of them were admitted to the United Nations on the same day, 17 September 1991. Because the claim was restoration rather than foundation, the founding dates on the country records reach back past the interruption: 24 February 1918 for Estonia, 18 November 1918 for Latvia, and 16 February 1918 alongside 11 March 1990 for Lithuania.

Two pieces of infrastructure being unpicked

The railways were laid to the 1,520 millimetre gauge used across the former Soviet Union, and they still are. Rail Baltica is building a 1,435 millimetre standard-gauge line from Tallinn through Riga and Kaunas to the Polish border, which is the gauge on the other side of it.

The electricity systems ran in the BRELL ring, synchronised with Russia and Belarus. The Baltic transmission operators left it on 8 February 2025, and ENTSO-E confirmed the following day that the systems of all the members here had been synchronised with the Continental European grid.

Where the edges are argued

The M49 standard published by the UN Statistics Division has no Baltic subregion at all. It files every member here under Northern Europe, beside Denmark, Finland, Iceland, Norway, Sweden, Ireland and the United Kingdom, and states that its groupings are a statistical convenience carrying no political meaning.

A wider reading takes the whole Baltic Sea rather than its eastern shore. The Council of the Baltic Sea States, founded at Copenhagen in 1992, seats Denmark, Estonia, Finland, Germany, Iceland, Latvia, Lithuania, Norway, Poland and Sweden together with the European Union. Russia sat in it from the founding until 3 March 2022, when the other members suspended its participation.

Two narrower readings cut in opposite directions. Follow the language family and Latvia and Lithuania are the Baltic countries while Estonia is Finnic, nearer to Finland than to either of its neighbours. Follow the imperial provinces instead and Lithuania is the member that falls outside. The catalogue records all three readings, files its members on the shoreline, and settles none of them.