The Black Sea is the world’s most isolated sea. As its catchment area is six times larger than its surface area, and every year about 350 km³ of river water from an area covering almost a third of continental Europe flow into the Black Sea, the Sea is very vulnerable to pressures resulting from land-based human activities such as industry, agriculture and growing urban communities. These activities are potential sources of pollution, and if not properly managed can have a negative impact on the water quality and water uses.