Sarnia is a city in Southwestern Ontario, Canada, and had a 2011 population of 72,366. It is the largest city on Lake Huron and in Lambton County. Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes where Lake Huron flows into the St. Clair River, which forms the Canada-United States border, directly across from Port Huron, Michigan. The city's natural harbour first attracted the French explorer La Salle, who named the site "The Rapids" when he had horses and men pull his 45 tonnes (50 short tons; 44 long tons) barque "Le Griffon" up the almost four-knot current of the St. Clair River on 23 August 1679.

Culturally, Sarnia is a large part of the artistic presence in Southern Ontario. The city's International Symphony Orchestra is renowned in the area and has won the Outstanding Community Orchestra Award given by the Detroit Music Awards in 2011. Michael Learned graced the stage of the Imperial Theatre for a 2010 production of Driving Miss Daisy. Sarnia Bayfest, which used to be the largest event in Sarnia annually, was a popular music festival that took place during the summer.