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Frederick Sound (aka Fridrikhe Zund) is a waterway passage in the Alexander Archipelago (Southeast Alaska). It separates Kupreanof Island (to the south) from Admiralty Island in the north. This Alaskan sound is named after Prince Frederick (Duke of York and Albany, 1763-1827) and was first charted in 1794.
During summer months, Frederick Sound is a popular whales watching location. The sound is also a busy passageway for both cruise ships and ferries serving the Alaska Marine Highway.
Five Finger Islands Light (lighthouse) is on a small island located between Frederick Sound and Stephens Passage.