Scientifically, not a Lily; not a Lotus either
Beautiful water-lilies are not lilies in the botanical sense of the word. They belong to two closely related geni, Nymphaea (the flowers of virgin nymphs!), and Nuphar, after a Greek name for the yellow pond-lily. In fact until very recently, the botanists thought there was just one species in the whole Nuphar genus, the common European yellow Nuphar lutea. These days they tend to agree that American yellow water-lilies belong to a number of distinct species ... they just can't decide exactly how many species!
There is a number of beautiful photographs of Nymphaeceae on SP already, but so few pictures captured the mountains reflecting amidst the water lilies! We are definitely looking for more pictures to add.