This formation was discovered and reported by Mirande Phernambucq. There if no information about this circle available.
Robert Boerman
Update 25-09-2006:
Farmer Sjaak Damen mailed us with some information about the Zeeland circle:
This circle is formed at july 25 at 4.45 pm. This circle is seen by some people and fisherman and they told about strange white lights and a buzzing noise at night.