The Water is found between Buttermere to the south and Loweswater to the north. The River Cocker is considered to start at the north of the lake, before then flowing into Lorton Vale. The hill of Mellbreak runs the full length of the lake on its western side; as Alfred Wainwright described it 'no pairing of hill and lake in Lakeland have a closer partnership than these'.
The lake is owned by the National Trust.
| ("Wikimedia Commons" has material|
about Crummock Water)
|Major waters of the Lake District|
|Cumberland:||Bassenthwaite Lake • Burnmoor Tarn • Buttermere • Cogra Moss • Crummock Water • Derwent Water • Devoke Water • Ennerdale Water • Loweswater • Thirlmere • Wast Water|
|Cumb. / Westm.:||Ullswater|
|Westmorland:||Grasmere • Haweswater • Rydal Water|
|Lancs. / Westm.:||Windermere • Elter Water|
|Lancashire:||Coniston Water • Esthwaite Water • Seathwaite Tarn • Tarn Hows|