There are a lot of geolocations in that area where you can still walk out onto sandbars during low tide. In this map, much of the green zone around Denmark is

There are a lot of geolocations in that area where you can still walk out onto sandbars during low tide. In this map, much of the green zone around Denmark is seasonally 'land'. Ye auld name for that peninsula, "Jutland", implicates inasmuch.