Hellespontum
Hellespontum is a Latin form of Hellespontus, meaning “the Sea of Helle; the Hellespont”. It is the genitive plural masculine noun or accusative singular masculine noun.
Found 39 times in the Latin texts on Socratos.
Where it is used
Ovid, Fasti 4.567: perque urbes Asiae longum petit Hellespontum,
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.