The Romanian Black Sea resorts or the Romanian Riviera stretch along the Black Sea coast from the Danube Delta at the northern end down to the Bulgarian Black Sea Coast in the south, along 275 kilometers of coastline. The most important resort is Mamaia, situated north of the city of Constanța on a narrow land slice that separates the Black Sea and Lake Siutghiol. Mamaia is a popular destination in the summer for Romanians and foreign tourists alike as a result of major investments in tourist infrastructure.