Sainte Marie is a city in Ontario, Canada, located on the St. Marys River. It is commonly known as Sault Ste. Marie, or simply Sault, which is the French spelling of the word 'sault, ' meaning 'RAPIDS.' The city is home to the world's largest international border crossing between the United States and Canada. It is also the oldest city in Ontario and the third oldest in Canada. The city is known for its rich history, culture, and natural beauty.