Original sentence: The Upper Volta Glacier  is between 1600 and 2000m altitude and is surrounded by the 3 peaks of Glacier Dome, Pickelhaube and Fastness Peak, while the Lower Volta Glacier  sits directly under the North side of Mount Aspiring and lies between 1000 and 1400m
Edited sentence: The Upper Volta Glacier  is between 1600 and 2000m altitude and is surrounded by the 3 peaks of Glacier Dome, Pickelhaube and Fastness Peak, while the Lower Volta Glacier  sits directly under the North side of Mount Aspiring/Tititea and lies between 1000 and 1400m