Balderich is a giant in Germanic mythology.
“A long, long time ago there lived in Rügen a mighty Giant named Balderich. He was vexed that the country was an island, and that he had always to wade through the sea when he wanted to go to Pomerania and the main land. He accordingly got an immense apron made, and he tied it round his waist and filled it with earth, for he wanted to make a dam of earth for himself from the island to the mainland.
As he was going with his load over Rodenkirchen, a hole tore in the apron, and the clay that fell out formed the Nine-hills. He stopped the hole and went on; but when he he had gotten to Gustau, another hole tore in the apron, and thirteen little hills fell out.
He proceeded to the sea with what he had now remaining, and pouring the earth into the waters, formed the hook of Prosnitz, and the pretty little peninsula of Drigge. But there still remained a small space between Rügen and Pomerania, which so incensed the Giant that he fell down in a fit and died, from which unfortunate accident his dam was never finished.”
THE FAIRY MYTHOLOGY BY THOMAS KEIGHTLEY (1850)