An area of land that drains to one river (or a river and its tributaries) is a drainage basin or watershed.
The area from which water drains into a river is called the river's watershed or drainage basin. It includes all the land and waterways that contribute runoff to that particular river system. Rainfall and other sources of water collect in the watershed, eventually flowing into the river and its tributaries.
A river basin is an area of land drained by a river and its tributaries.
The network formed by a river and its smaller streams is known as a river system or a watershed. The watershed includes all the land area that drains into the river and its tributaries, with smaller streams feeding into larger ones before finally reaching the main river.
headwaters
A river system that operates inside a drainage basin. A drainage basin is the area of land drained by a river and its tributaries.
delta:)
A river basin is an area of land where all the water not absorbed into the ground or evaporated into the air drains into one particular river. A tributary does not increase the size of a river basin because all a river's tributaries are already included in a river basin.
A river basin is an area of land where all the water not absorbed into the ground or evaporated into the air drains into one particular river. A tributary does not increase the size of a river basin because all a river's tributaries are already included in a river basin.
a watershed
I think you mean the source of a river, which is usually in the mountains.
I think you mean the source of a river, which is usually in the mountains.