Map showing the drainage basin of the Authie river, Picardie, France.
Data sources:

Background map: Image:Bassin versant de l'Authie.jpg by Antonov14 under CC-BY-3.0 and Image:Location Authie and Bresle River-fr.svg by Sémhur under GFDL &amp; CC-BY-SA-3.0, itself made from data from NASA Shuttle Radar Topography Mission  (SRTM3 v.2 &amp; SWDB) (public domain)
Locator map made from Blank_map_of_Europe_-_Atelier_graphique_colors.svg created by Historicair under GFDL &amp; CC-BY-SA-2.5 ; compass rose from Compass rose pale.svg (opacified) created by Fibonacci under GFDL ; scale from Image:Scale_kilometres_miles_svg.svg by Sémhur under GFDL &amp; CC-BY-SA-3.0.Softwares used:

Vectorized with Inkscape
The Gimp ;Others:

UTM map projection
WGS84 geodetic system
Shaded relief (ligth direction) : altitude 80°, azimuth 315°
Fonts: Times New Roman for sea and rivers labels, Arial for others.
Bourrichon