The Biesbosch was formed in the 15th century when flooding of the two rivers that surround this area swamped 14 villages. Many people were drowned and the water never did recede. Instead it formed this network of lakes and islands which are only accessible by boat. In the following centuries the islands were inhabited by skilled craftsmen working with reed and willow, as evidenced by the ancient pollarded trees found all over the Biesbosch.