Ploče is a town and seaport in the Dubrovnik-Neretva County of Croatia. Ploče is located on the Adriatic coast in Dalmatia just north of the Ner…Ploče is a town and seaport in the Dubrovnik-Neretva County of Croatia. Ploče is located on the Adriatic coast in Dalmatia just north of the Neretva Delta and is the natural seaside endpoint of most north-south routes through the central Dinaric Alps. This makes it the primary seaport used by Bosnia and Herzegovina and the endpoint of the Pan-European corridor 5C.