Firth of Clyde, Helensburgh

The Firth of Clyde is an inlet of the Atlantic Ocean off the southwest coast of Scotland, named for the River Clyde which empties into it. It encloses the largest and deepest coastal waters in the British Isles, sheltered from the Atlantic Ocean by the Kintyre peninsula which encloses the outer firth in Argyll and Ayrshire. Quoted from Wikipedia.