Seaforth picnic at Bowen Island, 1952 Bowen Island, British Columbia, is an island municipality in Howe Sound, is part of the Greater Vancouver Regional District, and is an island included within the jurisdiction of the Islands Trust. Approximately 6 km wide by 12 km long, the island at its closest point is about 3 km west of the mainland. There is regular ferry service from Horseshoe Bay, as well as water taxi services.