There are small detached portions in Waldeck, Thuringia, &c.; on the other hand the province enclaves the province of Oberhessen belonging to the grand-duchy of Hesse, and the circle of Wetzlar belonging to the Rhine Province.
The northern part is the province of Oberhessen; the southern consists of the contiguous provinces of Starkenburg and Rheinhessen.
There are also eleven very small exclaves, mostly grouped about Homburg to the south-west of Oberhessen; but the largest is Wimpfen on the north-west frontier of Wurttemberg.
Oberhessen is hilly; though of no great elevation it extends over the water-parting between the basins of the Rhine and the Weser, and in the Vogelsberg it has as its culminating point the Taufstein (2533 ft.).
Minerals, in which Oberhessen is much richer than the two other provinces, include iron, manganese, salt and some coal.