Geologically, the Franconian Heights belong to the
Keuper Uplands, which run through both the Franconian Keuper-Lias Land and through the adjacent
Swabian Keuper-Lias Land to the southwest, and is also surrounded by
lias country. Its northern continuation is the
Steigerwald, up to 499 m high, which transitions into the
Haßberge (up to 512 m) on the far side of the
River Main. Its southern continuation, the
Swabian-Franconian Forest, runs from the southern boundary of the Heights, mainly westwards, and is a little higher, climbing to 586 m. On its western side, the Franconian Heights end in a steep scarp (also called the
Trauf), and in the east, descends to the plains. The dominant rock type is (
keuper-)sandstone; the soils are relatively sandy. Old quarries, such as those in Obergailnau near
Wettringen bear witness to the former importance of this rock for house construction in the region. == Nature park ==