Porter's Lake is 19 km long, but never more than a kilometer wide and is in the shape of a crescent. It is one of the most popular lakes for recreational boating in the region. The Lake is connected to the Atlantic Ocean near Lawrencetown Beach, because of this, the lake varies in salinity from almost completely fresh water at the north end to nearly that of ocean water at the south end. The communities which surround Porter's Lake include, Porter's Lake, Middle Porter's Lake, West Porter's Lake, East Lawrencetown, Three Fathom Harbour and Seaforth. Crowell Road and West Porters Lake Road, run along the west side of the lake. Porters Lake Provincial Park is located off West Porter's Lake Road along the west side of the Lake. Hwy 107 crosses over the Lake and Hwy 7 runs north of the Lake. Hwy 207 runs south of the lake until just past Three Fathom Harbour, where there is limited access to the Lake by road on the east side as the highway and residential communities run along the Atlantic Ocean coast.