The Potamoi are the gods of rivers and streams of the earth in Greek mythology.
Nilus, the potamos of the Nile River, depicted in a Coptic tapestry
In Greek mythology, Oceanus was a Titan son of Uranus and Gaia, the husband of his sister the Titan Tethys, and the father of the river gods and the Oceanids, as well as being the great river which encircled the entire world.
Oceanus in the Trevi Fountain, Rome
Mosaic depicting Oceanus and Tethys, Zeugma Mosaic Museum, Gaziantep
Oceanus-faced gargoyle, originally from Treuchtlingen, Bavaria, now at the Staatliche Antikensammlungen, Munich
River Divinity, second century AD, Farnese collection, Naples National Archaeological Museum