It covers an area of about 2700 km2[1] and lies at the heart of the Westphalian Basin and the historic region of Münsterland in the north of Westphalia.
It is bounded to the west, north and east by the sandy countryside of the Westmünsterland and Ostmünsterland, whilst in the south it is bordered by the loess landscapes of the Hellweg Börde and Emscherland.
Geologically it rises clearly over the surrounding area on a bed of thinly covered Upper Cretaceous strata.
Another ridge, the Beckum Hills (up to 174 m) to the southeast is its own major landscape unit.
Kernmünsterland includes the city of Münster (less the northeast part) to the north, the district of Coesfeld (less the extreme west with Coesfeld and Billerbeck) to the west, the district of Warendorf (less the north with Sassenberg, Warendorf-Nord, Telgte and Ostbevern) to the east the centre of the historic Münsterland.