A report released by WWF points to ship accident-prone areas: the South China Sea & East Indies, east Mediterranean & Black Sea, and the busy shipping lanes around the British Isles, North Sea and Bay of Biscay. The busy shipping lanes around the British Isles, North Sea and Bay of Biscay had the fourth largest number of shipping accidents in the world, with 135 reported incidents between 1999 and 2011 including fires, collisions and leakage of toxic waste. The North Sea is one of the most intensively sailed seas in the world with over 120,000 ship movements taking place there every year. The WWF report also names the South China Sea and East Indies, east Mediterranean and Black Sea, as dangerous hotspots for accidents involving ships.