This story came from the region around Arendsee in the Altmark in Saxony-Anhalt. Arendsee is the name of a lake. Also an adjacent municipality is known by the same name.

Once upon a time, there was a large castle in place of the lake and the land. The castle sank under the ground all on a sudden; but reappeared soon as man and wife.  As they stepped forward, the wife noticed the swift change that took place in the location meanwhile. Her husband’s name was Arend. The lady uttered in sheer surprise, “Arend see, Arend see!” And that was reason people started calling the town as Arendsee that was built beside the lake.

Finest whitest particles of sand glittered in this lake, and when the sun shined bright, all the walls and buildings of the submerged castle were seen clearly like it is seen in Brok Sea near Ossenberg. Some people once thought of measuring the depth of the sea here. They threw a long rope into the sea to fathom it. As they pulled the rope, they saw a note pasted at the other end of the rope. What was written in it? “Do not be too curious. Engage yourself with your own business; otherwise your place will be devastated same way what you are seeing here.”

Arensea on Google map

People did not dare measuring the sea again.