The lake is about 5.4 kilometres (3.4 mi) long and 2.5 kilometres (1.6 mi) wide, and lies at an elevation of approximately 138 metres (453 ft).

Secondary inflows are the Clare River at the east and Sulphide Creek at Cosy Cove at the northeast.

There are three settlements on the lake: the village of Tweed at the Moira River inflow at the northwest; Cosy Cove, on the bay Cosy Cove and at the Sulphide Creek inflow at the northeast; and Stoco at the Moira River eastern channel outflow.

The Moira River flows into the Bay of Quinte on Lake Ontario at Belleville.

This Eastern Ontario geographical article is a stub.