The Long Rhön is an elongated basalt plateau in the centre, roughly 800 metres above sea level, which is only occasional interrupted by mountain peaks.

The B 278 and an imaginary line several hundred metres west to roughly the height of the Rhönhaus separates it from the Wasserkuppen Rhön.

The treeline as far as the Rhönkopf may be taken as the boundary with the Eastern slopes of the Long Rhön to the south and east of the area, continued by an imaginary line running north-northeast to the L1123 near Reichenhausen.

In 1969, Frankenheim had the following climatic statistics: 940 mm of precipitation, about 125 days of mist and fog during the year, and an average annual temperature of 5.1 °C.

[1] As a result of centuries of deforestation a harsh, grassland countryside has evolved on the Long Rhön.