IJsselmonde is a river island in the Netherlands, between the Nieuwe Maas, Noord and Oude Maas branches rivers of the Rhine-Meuse delta in the province of South Holland. The city of Rotterdam now occupies most of the northern part of the island and includes the eponymous former village of IJsselmonde, once a separate community. The island was once a rich agricultural region, but is mostly suburbs today. Only the mid-south parts of the island have retained their agricultural character.
Originally the Zwijndrechtse Waard, on which the municipalities of Hendrik-Ido-Ambacht and Zwijndrecht and the village of Rijsoord (partially) lie, was a separate river island, the western branch of river Waal separating the two. However, as the Waal stretch has been closed off at both ends, the Waard is now generally considered to be part of IJsselmonde. The dammed western end of the Waal river is now popularly referred to as Waaltje ("little Waal").