RCMP are searching for a man who is missing and presumed drowned at a regional park north of Saskatoon.

Witnesses said they saw the 60-year-old struggling in the water at Atton's Lake Regional Park on Monday.

He had been on an inflatable lounge chair about 50 metres from the shore when he somehow got separated from the chair.

One person tried to save him, but was not successful. Witnesses said they did not see the man resurface.

An underwater recovery team is now searching for the man's body.