Fig. 1: Map of Togo.

a Location of Togo in West Africa. b Five regions of Togo and its main river basins. Togo regions are indicated by grey borders and names; main rivers are indicated by light blue and names. River basins with superscript 1 are named but not depicted. Mô is a tributary of the Oti River. Ogou and Amou are tributaries of the Mono River. Yoto and Haho flow towards the delta of the Maritime Region. Maps were drawn by the authors in R. Data sources: country outlines and coastlines in a from: Natural Earth (public domain, www.naturalearthdata.com); administrative boundaries in b from: GADM v4.0 accessed via the geodata R package (v0.6-2; CC BY 4.0, https://github.com/rspatial/geodata); river networks/basins in b from: HydroSHEDS (HydroRIVERS/HydroBASINS; CC BY 4.0, www.d-maps.com).