Is there any river that does not discharge into larger body of water? Do you know any example of a river that does not flow into sea or lake? For example, if water rises from the underground spring and forms a river but water vaporises in hot climate before it reaches any larger body of water. Or if there is a valley with very moderate precipitation and many little creeks flow out of the valley and the water from them is absorbed by the soil.
The Okavango River is a good example of this. It drains into a swampy delta in the middle of the Kalahari desert:

The Okavango Delta, CC BY Justin Hall.