Three Seas Initiative

Three Seas Initiative
Logo
Membership
Establishment2015
Area
 Total
1,218,975 km2 (470,649 sq mi)
Population
 Estimate
110,150,445
 Density
90/km2 (233.1/sq mi)
GDP (nominal)2022 estimate
 Total
€2.295 trillion
 Per capita
€20,838
Website
3seas.eu

The Three Seas Initiative (3SI or TSI), known also as the Baltic, Adriatic, Black Sea (BABS) Initiative or simply as the Three Seas (Latin: Trimarium, Polish: Trójmorze), is a forum of thirteen states, in the European Union, running along a north–south axis from the Baltic Sea to the Adriatic and Black Seas in Central and Eastern Europe. The Initiative aims to create a regional dialogue on questions affecting the member states.

In 2016, representatives of the original 12 member states (Austria, Bulgaria, Croatia, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Romania, Slovakia, and Slovenia) met for their first summit in Dubrovnik, Croatia. At the seventh summit in Riga on 20 June 2022, Ukraine received the status of a partner-participant of the TSI, de facto becoming a participant in this initiative. At the 2023 summit, Greece became a member and Moldova a partner-participant, while at the 2025 summit, Albania and Montenegro became partner-participants.