The Mahanadi basin does not extend over which state ?

Karnataka

The correct answer is Option (1) - Karnataka

Chhattisgarh: The major portion of the Mahanadi basin lies in Chhattisgarh.

Odisha: The Mahanadi river flows through Odisha before draining into the Bay of Bengal.

Jharkhand: A comparatively smaller portion of the basin extends into Jharkhand.

Karnataka: A very small portion of the basin, mainly the Hasdeo River tributary, touches the border of Karnataka.