The rising ground that borders a river or stream is called a riverbank or streambank.

Here are some other terms that might be used:

* Riparian zone: This refers to the area of land alongside a body of water, including the bank itself and the adjacent vegetation.

* River bluff: This term is used when the bank is a steep, elevated slope.

* Floodplain: This is the flat area of land adjacent to a river that is subject to flooding.

The specific term used depends on the context and the specific features of the land.