Petrovaradin (Serbian Cyrillic: Петроварадин, pronounced [petroʋarǎdiːn]) is one of two city municipalities which constitute the city of Novi Sad. As of 2011, the urban area has 27,083 inhabitants, while the municipality has 33,865 people inhabitants. Lying across the river Danube from the main part of Novi Sad, it is built near the Petrovaradin Fortress, known as the "Gibraltar of the Danube".