With the consecration of St. Severus’s Monastery in 845, the village of Kettenbach was founded by Gebhard, Count of the Lahngau and had its first documentary mention.
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Oligocene shingle (Vallendar facies) overlies the older surface near Kettenbach and Hausen über Aar.
The line passes through Taunusstein, Bad Schwalbach (called Langenschwalbach until 1927), Aarbergen and Hahnstätten, which all lie in the Aar valley in the western Hintertaunus (the lower north-western ridges of the Taunus).
Hünstetten borders in the north on the community of Hünfelden, in the northeast on the town of Bad Camberg (both in Limburg-Weilburg), in the east on the town of Idstein, in the south on the town of Taunusstein and in the west on the communities of Hohenstein and Aarbergen (all in the Rheingau-Taunus-Kreis).