Nun Mill Bay, also known as the Dhoon, is located close to Kirkcudbright, part of Milton Sands in Kirkcudbright Bay.
The bay is known as The Dhoon, from the ironage hill fort behind the beach, across the road from the carpark.
It is known for the wreak of the the schooner, Monreith, which was built in Port William in 1880. During a voyage from Newcastle, County Down to Silloth, she was carrying 110 tons of granite kerb stones. The crew sought shelter in Kirkcudbright Bay on the 12th November 1900, due to a storm, she struck the sand bar at Nun Mill Bay. Her crew rowed to safely in the ship's boat. The cargo and anything of use was salvaged and the hulk was left to rot.
Today the remains can still be seen when the tide is low, an attraction for tourists and photographers.