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The 'Clarence Strait' is a strait in southeastern Alaska, in the United States in the Alexander Archipelago. The strait separates Prince of Wales Island, on the west side, from Revillagigedo Island and Annette Island, on the east side. Clarence Strait extends 201 km (125 miles) from the Dixon Entrance to Sumner Strait.
The Guard Island Light and Lincoln Rocks Light, both located adjacent to Clarence Strait, were important aids-to-navigation in the Clarence Strait area in the pre-automated era.