Gambier Island is about 17,049 acres (6,899 hectares) in size and is located about 10 kilometres (6.2 miles) north of the Horseshoe Bay community and ferry terminal. It is accessible only by very limited B.C. Ferries passenger service, connecting from the Langdale Ferry terminal, commercial water taxi or other private marine transportation.

There is no central road network, no public facilities or tourism infrastructure. Camping is available at Halkett Bay Provincial Marine Park, two sites along the Sea to Sky Marine Trail, and limited camping at Gambier Lake.

The island elects two trustees to the Islands Trust, an organization that unites small island communities in British Columbia to oversee development and land use. Other islands in Howe Sound include Keats Island and Anvil Island. The island is part of West Howe Sound, Electoral Area F within the Sunshine Coast Regional District (SCRD) on the Sunshine Coast of British Columbia, Canada.

Please take care visiting the island. Take only photos and memories, leaving nothing behind.