evidence: A pretty stretch of land along the Dalmatian coast is physically split from the rest of the country WHEN Croatia became the European Union's 28th member today, it did so leaving a substantial chunk of its territory effectively marooned. Croatia shares land borders in the north with two other existing EU members, Slovenia and Hungary. Its southernmost region, however, a pretty stretch of land along the Dalmatian coast, is physically split from the rest of the country and any other EU member state by a narrow strip of land and the small coastal town of Neum, which are part of Bosnia and Herzegovina.