The Acadian Peninsula is situated in the northeastern corner of New Brunswick, Canada, encompassing portions of Gloucester and Northumberland Counties. It derives its name from the large Acadian population located there. Two major islands off the northeast tip of the peninsula, Lamèque Island and Miscou Island, are culturally consider…The Acadian Peninsula is situated in the northeastern corner of New Brunswick, Canada, encompassing portions of Gloucester and Northumberland Counties. It derives its name from the large Acadian population located there. Two major islands off the northeast tip of the peninsula, Lamèque Island and Miscou Island, are culturally considered part of the Acadian Peninsula.