Lake of the Woods, Ontario, Canada May, 1998 The second largest inland lake in Ontario, Lake of the Woods can be seen in this west-northwest looking low-oblique view. Lake of the Woods is nearly 100 miles (161 km) long, 70 miles (115 km) wide, and covers an area of 1485 square miles (3846 sq km). Located in the southern Canadian Shield, Lake of the Woods was once part of the ancient glacial Lake Agassiz. The lake, with more than 14000 islands and almost 65000 miles (104650 km) of shoreline, is a resort area renowned for excellent fishing and other recreational activities. Headwaters of the Rainy River (right of center) are around Rainy Lake near International Falls, Minnesota (not visible on the image). The Rainy River flows 85 miles (135 km) westward along the Canadian and United States border before entering the Lake of the Woods.