Black Law is a hill in the Manor Hills range, part of the Southern Uplands of Scotland.

One of the more remote Donalds, it does not easily combine into a round with other hills in the area and requires traversing rough terrain to reach the top.

Common ascents are as part of an extended Dun Rig Horseshoe to the north-east, from the south at the Megget Reservoir or, most easily, from the Manor Valley itself.

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