rivers Amazon SYSTEMAmazon #0000ff 1.00 Congo SYSTEMCongo #0000f0 1.00 Lena SYSTEMLena #0000e1 1.00 Mackenzie SYSTEMMackenzie #0000d2 1.00 Mississippi SYSTEMMississippi #0000c3 1.00 Nile SYSTEMNile #0000b4 1.00 Ob SYSTEMOb #0000a5 1.00 Parana SYSTEMParana #000096 1.00 Tigris/Euphrates SYSTEMTigris #000087 1.00 Other SYSTEM. #000078 1.00