On which river in Bihar is the Karkat Waterfall, known for its natural crocodile habitat, located?

Q. On which river in Bihar is the Karkat Waterfall, known for its natural crocodile habitat, located?
Answer: Karmanasa River
Notes: Karkat Waterfall is situated on the Karmanasa River in Kaimur district, Bihar. It is a renowned natural habitat for crocodiles, lies within the Kaimur Wildlife Sanctuary, and is being developed as a Crocodile Conservation Reserve by the state government.