Many travellers in Western China have remarked the presence of ancient moraines long since severed from the glaciers which made them, of glacial lakes, ice-worn valleys, perched blocks, and other relics of glaciation. Throughout the Tibetan Marches, in the provinces of Szechuan and Yunnan, such evidence is abundant. Even on the southern face of the Himalaya, where very large glaciers exist, Hooker showed that the ice once extended over a much greater area.