Galiano Island is one of the Southern Gulf Islands between Vancouver Island and the Lower Mainland of British Columbia, Canada. Located on the west side of the Strait of Georgia, it is 27.5 km long, 6 km at its widest point, and 1.6 km across at its narrowest point and is separated from Saltspring Island by Trincomali Channel. On the western side of the island there are a series of sandstone caves. The island is northwest of Mayne Island, northeast of Saltspring Island and southeast of Valdes Island.