Malpeque Bay is a 204 km estuarine bay on the north shore of Prince Edward Island, Canada. Malpeque Bay is the second largest bay in terms of surface area in Prince Edward Island, following Hillsborough Bay. It is also notable for almost dividing the province; an isthmus occupied by the city of Summerside and the unincorporated communities of North St. …Malpeque Bay is a 204 km estuarine bay on the north shore of Prince Edward Island, Canada. Malpeque Bay is the second largest bay in terms of surface area in Prince Edward Island, following Hillsborough Bay. It is also notable for almost dividing the province; an isthmus occupied by the city of Summerside and the unincorporated communities of North St. Eleanors, Sherbrooke and Travellers Rest separates Malpeque Bay from Bedeque Bay on the island's south shore.