Skallingen has been formed through the ocean´s depositings of sand within the last 300 - 400 years. Until the beginning of the last century Skallingen had the significance of a high sandbank. First during the last century the peninsula has in time become green. Often it has happened, that the sea has broken through the dunes on the westside and in this for periods has parted it into islands. During time it has been created a marshland on the eastside by depositings of silts, which the tidal has transported into th Ho Bay. It is not allowed to bring dogs to Skallingen due to the life of aminals on Skallingen.