Strabo (p. 616) says that the sources of the Caicus are in a plain separated by the range of Temnus from the plain of Apiae, and that the plain of Apia lies above the plain of Thebe in the interior.
The general consensus among scholars is that Luwian was spoken—to varying degrees—across a large portion of western Anatolia, including Troy (Wilusa), the Seha River Land (Sēḫa ~ Sēḫariya, i.e., the Greek Hermos river and Kaikos valley), and the Mira-Kuwaliya kingdom with its core being the Maeander valley.
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