Castle Loch is a large, shallow, freshwater loch in Dumfries and Galloway, in the Southern Uplands of south-west Scotland.

It lies to the west of Mochrum Loch and about 9 mi (14 km) west of the town of Wigtown.

The loch was surveyed[1] in 1903 by James Murray and later charted [3] as part of Sir John Murray's Bathymetrical Survey of Fresh-Water Lochs of Scotland 1897-1909.

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