Extended Data Fig. 1: Relief roughness and elevation classes used for distinguishing mountain and lowland areas.
From: Increasing dependence of lowland populations on mountain water resources
The maps show the global mountain (a) and lowland (b) areas as defined in the Methods section, both excluding Greenland and Antarctica. Large lakes (>50 km²) are drawn here using their actual relief roughness (which is zero) rather than the assumed average roughness used for distinguishing mountain and lowland areas (Methods). The boundaries of catchments with an area of 100,000 km² and more are drawn for orientation.
