The Prontera Culverts in Ragnarok Online II is an instanced dungeon located near Prontera. In RO, the entrance to the culverts is located west of Prontera; in RO2, players must go through another of the culverts' entrances which is located farther north and can only be accessed through the eastern Mt. Mjolnir region. In addition, players can only access one piping section of the dungeon in RO2, compared to RO where the entire culverts system is accessible.