  wast water or wastwater is a lake located in wasdale, a valley in the western part of the lake district national park, england. the lake is almost 3 miles long (4.6 km) and more than a third of a mile (600 m) wide. it is the deepest lake in england at 258 feet (79 m), and is owned by the national trust. it is one of the finest examples of a glacially 'over-deepened' valley. the surface of the lake is about 200&nbsp;feet above sea level, while its bottom is over 50&nbsp;feet below sea level. thumb|wast water ==surroundings== the head of the wasdale valley is surrounded by some of the highest mountains in england, including scafell pike, great gable and lingmell. on 9 september 2007, wast water was announced as the winner of a vote to determine "britain's favourite view" by viewers of itv. the steep slopes on the south eastern side of the lake, leading up to the summits of whin rigg and illgill head, are known as the "wastwater screes" or on some maps as "the screes". these screes formed as a result of ice and weathering erosion on the rocks of the borrowdale volcanic group, that form the fells to the east of the lake, towards eskdale. they are approximately 2,000&nbsp;feet, from top to base, the base being about 200&nbsp;feet below the surface of the lake. a path runs the length of the lake, through the boulders and scree fall at the base of this craggy fell-side. on the north western side are the cliffs of buckbarrow (a part of seatallan) and the upturned-boat shape of yewbarrow. wast water is the source of the river irt which flows into the irish sea near ravenglass. ==etymology and usage== "wastwater" comes from "wasdale" plus english "water". " 'wasdale lake' or 'the lake of vatnsÃ¡, lake river'. the present name rather curiously contains the reflexes of both old norse 'vatn' 'water', 'lake', and old english 'wÃ¦te
Cumberland Lakes_of_Cumbria Sites_of_Special_Scientific_Interest_in_Cumbria Special_Areas_of_Conservation_in_England Underwater_diving_sites_in_the_United_Kingdom