Marina | 8590 Romanshorn FriedichshafnerstrasseThe Romanshorn municipality boat harbor is a public mooring and marina in the Romanshorn municipality in Switzerland. It is located on the east side of Lake Constance, at the mouth of the Rhine. The marina has berths for boats up to 50 meters long and offers a variety of services for boat owners, including a boat ramp, gas station and laundry.