What volume of water is deposited into the ocean from rivers in a year?

The total amount of water discharged by rivers into the oceans is approximately 45,800 cubic kilometers (11,000 cubic miles) per year. This is equivalent to a water layer of approximately 1.2 meters (4 feet) deep over the entire surface of the Earth. The majority of this discharge occurs in the tropics, where heavy rainfall and high temperatures contribute to increased river discharge.