Troutbeck Tongue branches off south-westward from the main Ill Bell ridge, just north of Froswick. It separates Trout Beck from Hagg Gill, its main upper tributary. These two streams almost reconverge behind the fell, the col connecting to Froswick being at only . This depression carries a number of ancient cairns at the base of the long grassy back-slope of the fell. The character of this side is in marked contrast to the southern tip of the fell, which drops steeply over rocky outcrops to Troutbeck Park.