The fell has an impressive appearance, a rugged height apparently blocking the
valley of
Borrowdale, which is squeezed between Castle Crag and
Grange Fell, its neighbour on the other side. This narrow
gorge known as the 'Jaws of Borrowdale', and is prominent in views from
Keswick and
Derwentwater. High Spy, the parent fell, forms part of the north-south ridge between Borrowdale and the Newlands Valley. The rough spur of Low Scawdel at runs out due east from the summit, breaking steeply over Goat Crag and then falling to Broadslack Gill. This small tributary of the River Derwent separates High Spy from Castle Crag. The wooded height of Castle Crag rises between Broadslack Gill and the Derwent, the two streams meeting to the north beneath the outlying knoll of Low Hows. It has steep faces on all sides except the south, where a low ridge runs out and then swings west around the head of Broadslack Gill. A narrow
col here provides the topographic link to High Spy. ==Geology, quarrying and Millican Dalton==