4. Croatia and Bosnia
Border: Neum Corridor
Area: 22 km* of coastline
Est. Gross Domestic Product: $55 billion (Bosnia) / $174.55 billion (Croatia)*
A curious geopolitical oddity, the Neum Corridor gives Bosnia and Herzegovina a short stretch of Adriatic Sea beachfront in the middle of Croatian territory. This 22-kilometer length of land, which dates back to the Treaty of Karlowitz in 1699, serves as both Bosnia's seaport and a historical relic.
Twitter accounts @BintingM and @Croatia
This corridor, which was built as a tactical barrier to stop the Venetian advance into the then-republic of Dubrovnik, has withstood the test of time, having withstood Ottoman dominance and contemporary boundaries. In terms of border management and regional collaboration, it presents particular opportunities and challenges for both Bosnia and Croatia, but it also acts as a crucial economic and strategic conduit for Bosnia and Herzegovina today.