Grottenhafen

Grottenhafen (Istvanistani: Troglonauts) is a port city on the eastern shore of the Cibolan Inner Sea and the administrative capital of both the Duchy of Rossheim and the district of Rossheim-Nord. The city's name, which means cave port in Cibolan Saxon, commemorates the Goetic Troglonauts of Cibola, whose principal commune was located on the site of the current settlement.

The city is believed to be a major Mondoist naval base, with underground bunkers for submarines and gravimetric warships.

Mondo has a residence in the city, the cave castle of Grottenhafen (Cibolan Saxon: Höhlenburg Grottenhafen).