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River network: HydroSHEDS HydroRIVERS v1.0 and HydroBASINS v1.c, © World Wildlife Fund, Inc. Lehner, B., Grill, G. (2013): Global river hydrography and network routing: baseline data and new approaches to study the world’s large river systems. Hydrological Processes 27(15): 2171–2186. hydrosheds.org. Watercourses: © OpenStreetMap contributors.