Ownership of rivers is a broad legal topic. The different ways by which we speak of rivers can confuse the layperson. In many jurisdictions and in certain situations property owners on both sides of a river each own the fee to the center of the river. Center lines of rivers form the boundaries of cities and states in many areas. The center of the river describes the limits to the property lines. The language used does not mean the abutters "own" the river. They own the land underneath it and their ownership is subject to the rights of the public to the use of the waters of the river. Federal and state laws govern rivers with federal law being the higher authority. "The public does not have a general right to cross private land to get to and from rivers, but such a right exists at traditional access routes . . . (according to) the legal doctrines of custom and prescription." You can study the many legal aspects of river use and public ownership at The National Organization for Rivers website provided below.
A canyon
A stream of water cutting through land is a river.
old river
A canyon is a land form that is carved by running water over a long period of time, usually through erosion. The force of the water wears away the rock or soil, resulting in the formation of a deep, narrow valley with steep sides.
river
Land drained by a river is a watershed. This is an area of land that feeds all the water running under it and draining off of it into a body of water.
The Rhine river flows through Europe, which is part of the Eurasian land mass.
A river.
Marine Land
a river
The landscape in Sudan varies, with desert in the north and savannah in the south. The country also has the Nile River running through it, providing fertile land for agriculture along its banks. Sudan's terrain includes mountains, plains, and plateaus.
You could be referring to the River NIle