09- Slenaken, Limburg, 17-06-1998.
Report from Eltjo Haselhoff.
A ring with three smaller satellite circles. Inner edge ring: 16m, outer edge ring: 24 m diameter. Satellite circles 7.0, 7.1 and 7.5 m diameter. The three satellites had deep holes in the centre, about one cm wide. The centre of the ring was about two meters off the tram lines.