Belfast Lough is a large, intertidal sea inlet on the east coast of Northern Ireland. At its head is the city and port of Belfast, which sits at the mouth of the River Lagan. The lough opens into the North Channel and connects Belfast to the Irish Sea. Belfast Lough is a long, wide and deep expanse of water, virtually free of strong tides. The inner part of the lough comprises a series of mudflats and lagoons. The outer lough is restricted to mainly rocky shores with some small sandy bays. The outer boundary of the lough is a line joining Orlock Point and Blackhead. The main coastal towns are Bangor on the southern shore (County Down) and Carrickfergus on the northern shore (County Antrim). Other coastal settlements include Holywood, Helen's Bay, Greenisland and Whitehead. Name Belfast Lough is known in Irish as Loch Lao, which was Anglicised as 'Lough Lee'. Earlier spellings include Loch Laoigh and Loch Laigh. This name means "sea inlet of the calf". The River Lagan, which flows into it, was also historically known as the Lao. It is believed that the lough and river were named after a "bovine goddess". In the 2nd century, the Greek geographer Ptolemy referred to it as the Logia. Before Belfast grew into a city, the lough was known in English as 'Carrickfergus Bay'. In Ulster-Scots it is called Bilfawst Loch or Craigfergus Loch. History In 1689 during the War of the Two Kings the Williamite expeditionary force under Marshal Schomberg landed at Bangor, after the lough had been cleared of French shipping by George Rooke. Schomberg occupied the towns of Bangor and Belfast, before successfully laying siege to Carrickfergus. The following year William III also used the lough as a safe anchorage when he arrived in Ireland with reinforcements for Schomberg in the run-up to the victory over the Jacobite army at the Battle of the Boyne. Wildlife Nature reserve The "inner lough" was made an Area of Special Scientific Interest (ASSI) in 1987. Recorded wildlife includes Crepidula fornicata Lamarck (Slipper Limpet). Ramsar site The Belfast Lough Ramsar site (wetlands of international importance designated under the Ramsar Convention), is 432.14 hectares in area, at latitude 54 38 00 N and longitude 05 54 00 W. It was designated a Ramsar site on 5 August 1998. In the outer lough, the Ramsar boundary entirely coincides with that of Outer Belfast