Doetinchem is a city and municipality in the east of the Netherlands. It is situated along the Oude IJssel river in a part of the province of Gelderland called the Achterhoek. The municipality had a population of 58,270 in 2021 and consists of an area of 79.66 km2 (30.76 sq mi) of which 0.61 km2 (0.24 sq mi) is water. This makes Doetinchem the largest town in the Achterhoek.

The IJssel is a Dutch distributary of the river Rhine that flows northward and ultimately discharges into the IJsselmeer, a North Sea natural harbour. It more immediately flows into the east-south channel around the Flevopolder, Flevoland which is kept at 3 metres below sea level. This body of water is then pumped up into the IJsselmeer.