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Discover LudwigThe phrase "drainage basin" is correct and usable in written English.
You can use it to refer to a hydrological unit of land, typically bounded by ridges or hills, which catches and drains water from surrounding areas. For example, "The river runs through the large drainage basin of the Rocky Mountains."
Dictionary
drainage basin
noun
A topographic region in which all water drains to a common outlet; a watershed.
Exact(60)
Rainfall varies considerably throughout the drainage basin.
He pointed out that there were 8,000 dams in the drainage basin of the Mississippi.
It has a drainage basin of some 12,000 square miles (31,000 square km).
The area of its drainage basin is 4,208 square miles (10,898 square km).
The northwestern region is arid and eroded by the wind; it forms an inland drainage basin.
Its drainage basin encompasses some 174,000 square miles (450,000 square km).
The lake's drainage basin covers an area of 7,420 square miles (19,220 square km).
The Tone River is an indispensable source of water for irrigation throughout its populous drainage basin.
The Tone is the second longest river in Japan, and its drainage basin is the largest.
The area of its drainage basin is 18,000 square miles (46,500 square km).
The Trans-Alaska Pipeline crosses the northeastern section of the Koyukuk drainage basin.
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