To the north and west of the Hart Side and Green Side ridge, and to the east of Birkett Fell, grassy slopes drop into Deepdale, with an outcrop of rock just beneath the Hart Side summit, called Hart Crag, and the broken crags beneath Birkett Fell. This Deepdale should not be confused with the valley of the same name near Patterdale. These sides of the ridge are drained by Aira Beck into Ullswater.