An arm of the sea (or sea arm) may refer to:

• a sea loch
• an ocean arm
• Arms of the Sea, a 2006 album by Celtic musician Heather Alexander
• Nullah, in Hindi
• Gulf of Lune, a fictitious sea arm in J.R.R. Tolkien's Middle-earth fantasy universe

This disambiguation page lists articles associated with the title Arm of the sea.
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