Allegheny City (1788–1907) was a Pennsylvania municipality located on the north side of the confluence of the Allegheny River with the Monongahela, where they form the Ohio River. Allegheny City was west across the Allegheny River from downtown Pittsburgh, with its southwest border formed by the Ohio River. It was annexed by Pittsburgh in 1907. The former area of Allegheny City is known today as the North Side of Pittsburgh, and its waterfront district, along the Allegheny and Ohio rivers, is known as the North Shore.