Wareham is the innermost town on the north shore of Buzzards Bay. The Weweantic River empties in the southwest corner of town, with the Sippican River and other brooks emptying into it. The Wareham River, which is formed at the confluence of the Wankinco and Agawam rivers, flows into the harbor east of the Weweantic, and has brooks and the Mill Pond River as tributaries. To the east lie Onset Bay and Buttermilk Bay, both of which empty into the head of the bay, at the right-of-way of the Cape Cod Canal. Between these rivers and bays lie several points and necks, including Cromesett Point, Swift's Neck, Long Beach Point, Indian Neck, Stony Point, Cedar Island Point, Codman's Point, Sias Point and Whittemore's Point. The southern boundary of Myles Standish State Forest is concurrent with the town line between Wareham and Plymouth.