Overijssel (Transiselania) is a province of the Netherlands in the central eastern part of the country. The province's name in both Dutch and Latin means "Lands across river IJssel". The capital city of Overijssel is Zwolle.
To the southeast, the province's surface is mostly sandy, interspersed with small rivers, such as, Regge and Dinkel and brooks, in the northwest, the geology is dominated by sediments from the Overijsselse Vecht and clay. The northern parts were once covered by veen (bogs) which separated the dryer and more arable south from Drenthe and which have been exploited as fuel to a large degree. Only small patches survive today (Engbertsdijksvenen near Tubbergen, Witteveen (near Haaksbergen), and the Aamsveen (near Enschede). The extreme northwest is dominated by a system of lakes formed by former peat-mining, the Weerribben, which is a valuable wetland.
The highest point in Overijssel is the summit of the Tankenberg, a hill in the municipality of Losser, at 89 metres (295 ft). The lowest point is in the Mastenbroek Polder near Kampen at 2 metres (6 ft) below sea level.
After a brief occupation by the forces of the Bishop of Münster (1672–74), Overijssel received a new form of government which granted the stadtholders more power. Widespread resistance against the increased power throughout the provinces eventually led to the formation of the Batavian Republic in 1795. A centralist government arose and the Netherlands was organised into a series of départements, based on those used by revolutionary France. At first organised into its own département, it was merged with Drenthe in 1798 to form Ouden Ijssel, which was renamed Overijssel in 1801.
The French annexed the Batavian Republic in 1810, and Overijssel was organised into the new French département of Bouches-de-l'Yssel. After the defeat of Napoleon in 1814, the kingdom of the Netherlands and the former province of Overijssel were recreated. Overijssel was briefly occupied by Nazi Germany during World War II from May 1940 until its liberation in April 1945. The Noordoostpolder, which had been laid dry in 1942, was part of Overijssel from 1962 until 1986, when it became part of the newly created province of Flevoland.