Situated between Loweswater and Buttermere. Often overlooked by its sister lake Buttermere, Crummock Water with the mighty Grassmoor on the west and the fells of Mellbreak on the east, it has unparalleled views from either side. It is 2 1/2 miles long, 3/4 mile wide and 140 feet deep and is a clear, rocky bottomed lake flanked by steep fellsides of Skiddaw slate.

The lake is fed by numerous streams including the beck from Scale Force, which with a drop of 170 feet is Lakeland’s tallest waterfall. The River Cocker starts from here, flowing towards Cockermouth where it joins the River Derwent.

Mellbreak is a hill in the Western part of the English Lake District. Despite being surrounded on all sides by higher fells (the Loweswater Fells, the High Stile Ridge and the Grasmoor Group), it stands in isolation. It is surrounded on three sides by a "moat" of deep marshy land, and on the east side by the lake of Crummock Water. The fell forms a partnership with the lake, running parallel to it, falling sheer into it, and regularly providing the backdrop for pictures of it.