It arises in the Tumuc-Humac Mountains, which forms the drainage divide between Pará, Brazil, and Suriname; from there it flows northward.

[1] The Coeroeni goes on to form the border of the disputed Tigri Area[2] by Guyana and Suriname.

[1] It eventually flows into the Courantyne River, which forms the international boundary between Guyana–Suriname.

Which one is deemed the proper upper Corentyne was between the expedition of Robert H. Schomburgk, and later Barrington Brown who found the New River.

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