Ebenezer William “Bill” Peyto. Mountaineer, park warden and pioneer in the Banff area. One can easily guess the reason for talking about this man in the context of Peyto Lake, it is named after him. The unreal colour of the lake is caused by glacial rock flour, generated through glacial erosion. Interesting facts to know, although they can’t compete to the most interesting thing: Just looking at it.