Lough Neagh (/lɒx neɪ/ LOKH NAY) is a large freshwater lake in Northern Ireland. It is the largest lake by area in the British Isles, with a surface area of 151 square miles (392 square kilometres). It supplies 40% of Northern Ireland's water. Its main inflows are the Upper River Bann and River Blackwater, and its main outflow is the Lower River Bann. Its name comes from Irish: Loch nEachach, meaning 'Eachaidh's lake' (Irish: [l̪ˠɔx ˈn̠ʲahax]). The lough is owned by the Earl of Shaftesbury and managed by Lough Neagh Partnership Ltd.