The OPP are searching Lake St. Clair near Stoney Point for a boater who has not been seen since Sunday.
Provincial police say the 58-year-old man left around 8 a.m. in a small vessel to go fishing.
Police were contacted when a kayaker came across the unoccupied boat on a sandbar.
An extensive search was launched with OPP marine units from Essex County and Chatham-Kent, along with the Joint Rescue Co-ordination Centre.
As of 8 p.m. Sunday, provincial police say the search was taking place on the water and in the air.
The missing boater is described as 5'10", 240 pounds with a medium build, green eyes, short grey hair, goatee and wearing glasses.
He was last seen wearing a blue, two-tone tank top and light blue shorts.
OPP is asking for anyone who may have any information to assist with the investigation to contact them at 1-888-310-1122.