In order to secure the riverbank, it was sufficient to erect free-standing towers backed up by the forts of the units stationed nearby; there was never a continuous barrier of palisades and ditches here. However, of the many watchtowers that probably stood along the Main, to date only one south of Obernburg am Main has been identified. On the other bank of the Main was the largely uninhabited Spessart, a wooded hill range which, like the Odenwald which borders it to the south-west, was particularly interesting for the Romans, especially because of its timber. In inscriptions, there are reports of the logging vexillationes of the 22nd Legion, which were stationed in Obernburg, Stockstadt and Trennfurt. In the majority of forts, settlement activity continued after the fall of the limes, which is why, as in Obernburg Niedernberg, Seligenstadt and Großkrotzenburg, they are now located below the medieval village centres. In Grosskrotzenburg, Hainstadt, Stockstadt and Obernburg, Alamannic artefacts were also discovered.
Route
North of the Main the limes initially runs through the marshy terrain of the Schifflache and Bulau before linking up with the Wetterau Limes. At the crossing of the Main at Großkrotzenburg a Roman bridge has been identified from post sockets. In the south it extended in its early period to Obernburg or Wörth. The exact start point of the Odenwald Limes has still not been clearly identified. When the Odenwald Limes was abandoned in the 2nd century A.D. by Antoninus Pius and the establishment of the newer limes in the Bauland, the Main Limes was also extended, because the forts in Trennfurt and Miltenberg were added.
Dietwulf Baatz, Fritz-Rudolf Herrmann : Die Römer in Hessen. Lizenzausgabe der 3rd edition, 1989, Nikol, Hamburg, 2002,.
Bernhard Beckmann: Neuere Untersuchungen zum römischen Limeskastell Miltenberg-Altstadt. Verlag Michael Lassleben. Kallmünz, 2004,.
Bernd Steidl: Welterbe Limes – Roms Grenze am Main. Begleitband zur Ausstellung in der Archäologischen Staatssammlung Munich, 2008. Logo, Obernburg, 2008,.
Kurt Stade: Die Mainlinie von Seligenstadt bis Miltenberg mit einem Nachtrage zur Abt. B Nr. 33 Kastell Stockstadt. In: Ernst Fabricius, Felix Hettner, Oscar von Sarwey : Der obergermanisch-raetische Limes des Roemerreiches. Abt. A, Strecke 6, pp. 3–70.
Britta Rabold, Egon Schallmayer, Andreas Thiel: Der Limes. Die Deutsche Limes-Straße vom Rhein bis zur Donau. Verein Deutsche Limes-Straße, K. Theiss Verlag, Stuttgart, 2000,.
