Moray Firth the Moray Firth and Highland, Moray and Aberdeenshire to the south. The firth has more than 800 kilometres (about 500 miles) of coastline, much of which is cliff. A number of rivers flow into the Moray Firth, including the River Ness, the River Findhorn and the River Spey. Various smaller firths and bays are inlets of the firth, including the Cromarty Firth and the Dornoch Firth. The Pentland Firth has its eastern mouth at the Moray Firth's northern boundary. The Moray Firth is effectively two firths, the Inner Moray Firth , which was traditionally known as the Firth of Inverness,
Firth of Lorn Mull, with widths of from to , inclusive of the islands on the east side, such as Kerrera and the Slate Islands. The west side is an ample deep-water channel leading ultimately inland to the Caledonian Canal. Although the English word firth, the Gaelic equivalent linne (as in Linne Foirthe, Firth of Forth), and all the major firth names, have been in use since proto-historic times in Scotland, the combination “Firth of Lorn” was not innovated until the late 19th century. Lorn is presumed in modern Gaelic dictionaries to be a syncope of its Gaelic form Latharna, as is the