King's Cave (Scottish Gaelic: Uamh an Rìgh) is the largest of a series of seafront caves north of Blackwaterfoot on the Isle of Arran in Scotland.

[1] The caves were formed around 10,000 to 6,000 years ago during an ice age when the weight of an advancing glacier forced the land downward, so the sea was higher relative to the location of the cave, with high tide around 4 metres (13 ft) up from its present level.

The hillside above the cliffs has a shallow slope resulting from a much earlier raised beach, nominally 30 metres (98 ft) above present high tide.

[5] The current name of the cave is linked to the legend of Robert the Bruce seeking refuge in a cave where he is said to have been inspired by watching a spider's numerous and ultimately successful attempts to build a web,[6][7] but this story is widely considered apocryphal.

[4] A 32 foot long trench was dug and examined, but aside from a small bronze ornament and some animal bones, nothing of interest was found, so the dig was halted on the fourth day.