A man remains missing after his canoe tipped over on a river in southwestern NSW, police say.

The man, aged in his late 20s, was paddling on the Murrumbidgee River when the canoe overturned about 2.30pm on Sunday.

He failed to resurface, police said.

Police and emergency services were called to a caravan park at Darlington Point and a search was begun.

It was suspended at nightfall and resumed at first light on Monday involving local police officers, the State Emergency Service and Volunteer Rescue Association.

AAP