Aisgill

Coordinates: 54°21′52″N 2°20′30″W / 54.36443°N 2.34162°W / 54.36443; -2.34162

Aisgill is the southernmost of the hamlets that comprise the parish of Mallerstang in the English county of Cumbria. It is on the B6259 road, at the head of Mallerstang dale, just before the boundary between Cumbria and North Yorkshire.

The highest waterfall on the River Eden, Hellgill Force, with a drop of about 9.75 metres (according to recent measurements) is just to the north, at grid reference SD779966. The river itself rises (at first as Red Gill beck, later becoming Hell Gill beck) below Hugh Seat in the peat bogs above here. It finally becomes the river Eden after merging with the Ais Gill beck, which flows down from Wild Boar Fell.

Aisgill is at both a county and a natural geographical boundary. It is at the watershed (sometimes called "the watershed of England") from which the Eden flows north towards the Irish Sea via the Solway Firth, while the River Ure flows south towards Wensleydale, and eventually into the North Sea.