Ὑψίζοντος

Notes

1. The headword (evidently quoted from somewhere) and the gloss are in the genitive singular. Herodian and other grammarians give nominative and genitive together, and also confirm that Hypsizon is a river name.
   Its location is unknown. However [NF], this may be a reference to Forum Traiani in Sardinia↗, of which the earlier name was Hydata Hypsitana; see Barrington Atlas map 48 grid A3. The city is set up in the hills (hypsi = high) and although the nearby river is called Thyrsos, the name 'Hydata' (waters) may have caused the river reference. Alternatively (and much more tenuously) there are 2 River Hypsas in Sicily↗, and Strabo 8.3.25 mentions a River Hypsois in Elis-Triphylia↗.