Forest is a community in Lambton Shores, Ontario, Canada, near Sarnia and Lake Huron in Lambton County. It has a population of 2,876 and a land area of 5.26 square kilometres. Forest's high school is North Lambton Secondary School. This facility includes a large gymnasium and cafeteria, as well as meal preparation facilities. The community also has elemeā¦Forest is a community in Lambton Shores, Ontario, Canada, near Sarnia and Lake Huron in Lambton County. It has a population of 2,876 and a land area of 5.26 square kilometres. Forest's high school is North Lambton Secondary School. This facility includes a large gymnasium and cafeteria, as well as meal preparation facilities. The community also has elementary schools in both the public and catholic school systems.