Lena Amazon QKX8QKX QKX8QKX QKX8QKX QKX8QKX Mississippi QKX8QKX Nile QKX8QKX QKX8QKX QKX8QKX QKX8QKX Congo QKX8QKX QKX8QKX QKX8QKX QKX8QKX QKX8QKX Tigris/Euphrates Tigris/Euphrates QKX8QKX QKX8QKX Mackenzie Amazon QKX8QKX QKX8QKX QKX8QKX Ob Amazon QKX8QKX QKX8QKX QKX8QKX Lena Congo Congo Mackenzie Amazon Amazon QKX8QKX QKX8QKX Mississippi Mississippi Tigris/Euphrates QKX8QKX QKX8QKX QKX8QKX St. Lawrence QKX8QKX Nile St. Lawrence Ob Mississippi QKX8QKX QKX8QKX Parana Parana Mackenzie QKX8QKX Amazon Amazon QKX8QKX Amazon QKX8QKX Parana Amazon Amazon Amazon Parana Amazon QKX8QKX QKX8QKX QKX8QKX QKX8QKX Tigris/Euphrates Mackenzie QKX8QKX St. Lawrence QKX8QKX QKX8QKX Amazon Tigris/Euphrates Ob QKX8QKX Congo Amazon QKX8QKX Lena QKX8QKX QKX8QKX Nile QKX8QKX Amazon QKX8QKX QKX8QKX QKX8QKX QKX8QKX St. Lawrence