Lethe

One of the two systems of canals that run through the Oppidan Maze of Dis, the Lethe guides the River Styx through the infernal city. Unlike the Andramal, which is only allowed to be used by the city's nobility, the Lethe is open to public use and serves as a main route of transportation for mortals, planar traders, the undead, lesser devils, servants of lesser deities, or anyone else who is traveling through or calls Dis their home.