 The Sissiboo Lowlands comprise many river valleys and lowland inland areas in the southwest and central portion of the peninsula.The South Mountain is a steadily rising slope that descends sharply at the Annapolis Valley but more gradually toward the Atlantic, resulting in a plateau across much of the southwest interior of the peninsula with average elevations of 150 m and maximum elevations of 275 m. Slate ridges are prominent in the Rawdon Hills and Wittenburg Ridge areas along the boundary with the Carboniferous Lowlands.The Fundy Coast region includes the North Mountain ridge as well as the Digby Neck and the Economy Mountain areas along the north side of the Minas Basin.