ملف:Bassin de l'Authie-fr.svg

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 & CC-BY-SA-3.0, itself made from data from NASA Shuttle Radar Topography Mission (SRTM3 v.2 & SWDB) (public domain)
  
• Locator map made from Blank_map_of_Europe_-_Atelier_graphique_colors.svg created by Historicair under GFDL & 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 & 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.