Koper is a coastal town and municipality and the largest commercial port in Slovenia, on the coast of the Adriatic Sea. The town has a population of 23,726 and is the main urban center of Slovenian Istria. The town of Koper is officially bilingual, with both Slovene and Italian as official languages. Sights in Koper include the 15th-century Praetorian Palace and Loggia in Venetian Gothic style, the 12th century Carmine Rotunda church, and the Cathedral of St Nazarius, with its 14th-century tower.
Koper is also one of the main road entry points into Slovenia from Italy, which lies to the north of the municipality. The main motorway crossing is at Spodnje Škofije to the north of the town of Koper. The motorway continues into Rabuiese and Trieste. Koper also has a rail connection with the capital city, Ljubljana. On the coast, there is a crossing at Lazaret into Lazaretto in Muggia municipality in Trieste province. The Italian border crossing is known as San Bartolomeo.