These three firths denote different parts of an arm of the sea which has two constrictions;—one between Craigton Point and Longman Point, and the other between Fort George and the Chanonry Point. The upper part is known as the Beauly Firth, the intermediate portion as the Inverness Firth, and the outer part as the Moray Firth. Two rivers discharge their contents into this arm of the sea; the Beauly River, which flows in at the head of the Beauly Firth, and the Eiver Ness, which joins at the head of the Inverness Firth.