Windermere (sometimes tautologically called Windermere Lake to distinguish it from the nearby town of Windermere) is a ribbon lake in the Lake District in North West England. It is the largest lake in England by length, area, and volume, but considerably smaller than the largest Scottish lochs and Northern Irish loughs. The lake is about in length and at its widest, has a maximum depth of , and has an elevation of above sea level. Its outflow is the River Leven, which drains into Morecambe Bay. The lake is in the administrative council area of Westmorland and Furness and the historic county of Westmorland. It has been one of the country's most popular places for holidays and summer homes since the arrival of the Kendal and Windermere Railway's branch line in 1847.
The word 'Windermere' is thought to translate as "'Winand or Vinand's lake'... The specific has usually been identified with an Old Swedish personal name 'Vinandr', genitive singular 'Vinandar'"... although "the personal noun is of very restricted distribution even in Sweden." Another possibility is that it refers to a "Continental Germanic personal noun, 'Wīnand'...Since this name could not have been current until the 12th century, the fact that the Old Norse genitive singular '-ar-' has been added to it, it would suggest that Old Norse was still a living language in the area at that time."
Alternative spellings may be 'Wynhendermere' and 'Wynenderme'
The second element is Old English 'mere', meaning 'lake' or 'pool'. It was known as "Winander Mere" or "Winandermere" until at least the 19th century.
Its name suggests it is a mere, a lake that is broad in relation to its depth, but despite the name this is not the case for Windermere, which in particular has a noticeable thermocline, distinguishing it from typical meres. Until the 19th century, the term "lake" was, indeed, not much used by or known to the native inhabitants of the area, who referred to it as Windermere/Winandermere Water, or (in their dialect) Windermer Watter.