Owing to these natural "locks," the Senegal never discharges less than 1700 or 1800 cubic ft.
It receives many streams, and discharges at the south-western extremity by the Ericht.
The Seine descends from the Langres plateau, flows northwest down to Mry, turns to the west, resumes its north-westerly direction at Montereau, passes through Paris and Rouen and discharges itself into the Channel between Le Havre and Honfleur.
There is no municipal water-supply, and the main drain of the city discharges into the lower pool of Siloam, which has become an open cesspit.
Besides those mentioned, there are a number of smaller rivers discharging on the north coast, and on the west shore of the Gulf of Carpentaria the Roper river discharges itself into Limmen Bight.