Lough Neagh, sometimes Loch Neagh, (pronounced /ˌlɒx ˈneɪ/, lokh nay) is a freshwater lake in Northern Ireland. It is the biggest lake in Northern Ireland, supplying forty percent of its water; the biggest on the island of Ireland, the biggest by area in the United Kingdom, and the biggest by area in the British Isles. Its name comes from Irish: Loch nEachach, meaning "Lake of Eachaidh", although today it is usually spelt Loch nEathach (Irish: [ɫ̪ɔx ˈn̠ʲahax]) in Irish.