Heptaporos was one of the 3,000 Potamoi (River-Gods). His domain was a small tributary in northern Mysia, Anatolia (an area which is now part of modern-day Turkey).
Heptaporos was only one of multiple tributaries of the river Skamandros. Heptaporos' river had his headwaters on Mt. Ida. Some of the other tributaries which flowed into Skamandros were the Simoeis and the Kebren.
And Tethys bare to Ocean eddying rivers, Nilus, and Alpheus, and deep-swirling Eridanus, Strymon, and Meander, and the fair stream of Ister, and Phasis, and Rhesus, and the silver eddies of Achelous, Nessus, and Rhodius, Haliacmon, and Heptaporus, Granicus, and Aesepus, and holy Simois, and Peneus, and Hermus, and Caicus fair stream, and great Sangarius, Ladon, Parthenius, Euenus, Ardescus, and divine Scamander.
- Hesoid, Theogony 334-337
"So then amid the huts the valiant son of Menoetius was tending the wounded Eurypylus, but the others, Argives and Trojans, fought on in throngs, nor were the ditch of the Danaans and their wide wall above long to protect them, the wall that they had builded as a defence for their ships and had drawn a trench about it—yet they gave not glorious hecatombs to the gods—that it might hold within its bounds their swift ships and abundant spoil, and keep all safe. Howbeit against the will of the immortal gods was it builded; wherefore for no long time did it abide unbroken. As long as Hector yet lived, and Achilles yet cherished his wrath, and the city of king Priam was unsacked, even so long the great wall of the Achaeans likewise abode unbroken. But when all the bravest of the Trojans had died and many of the Argives—some were slain and some were left—and the city of Priam was sacked in the tenth year, and the Argives had gone back in their ships to their dear native land, then verily did Poseidon and Apollo take counsel to sweep away the wall, bringing against it the might of all the rivers that flow forth from the mountains of Ida to the sea—Rhesus and Heptaporus and Caresus and Rhodius, and Granicus and Aesepus, and goodly Scamander, and Simois, by the banks whereof many shields of bull's-hide and many helms fell in the dust, and the race of men half-divine—of all these did Phoebus Apollo turn the mouths together, and for nine days' space he drave their flood against the wall; and Zeus rained ever continually, that the sooner he might whelm the wall in the salt sea. And the Shaker of Earth, bearing his trident in his hands, was himself the leader, and swept forth upon the waves all the foundations of beams and stones, that the Achaeans had laid with toil, and made all smooth along the strong stream of the Hellespont, and again covered the great beach with sand, when he had swept away the wall; and the rivers he turned back to flow in the channel, where aforetime they had been wont to pour their fair streams of water."
- Homer, Illiad 12. 1 - 12. 33