What is "zeesenboot"

A Zeesenboot, in plattdeutsch Zeesboot or Zeeskahn, is a usually 10-metre-long, wide-hulled sailing boat of a type known as a Haffboot. The name is derived from the type of fishing gear used, known as a zeese. The sailing boat is designed for relatively protected, shallow waters. Today zeesenboote are mainly used for leisure sailing.