A loch (or, usually spelled Lough as a name element outside Scotland), is a body of water which is either: a lake or a sea inlet, which may be also a firth, fjord, estuary, strait, or bay. Sea-inlet lochs are often called sea lochs. Background This name for a body of water is GaelicThe word has currency in the following languages: Scottish Gaelic, Irish, Manx and Lowland Scots; in addition to Scottish English, Irish English and Standard English. in origin and is applied to most lakes in Scotlan… (More on Loch)