path under the Grebbeberg. As a result of the erosive effect of the river system of the Rhine, the originally existing connection between the Utrechtse Heuvelrug and the moraine of Ede - Wageningen has been broken. The very steep slopes of the Grebbeberg are the visible result of this process. The Grebbeberg is a geologically valuable area. The southern flank of the Grebbeberg was the first geological monument designated by the province of Utrecht. Topography The name Grebbeberg is derived from the or Grebbe, a historic canal and predecessor of the that opened into the Lower Rhine at the foot of the Grebbeberg. The northern part of the Grebbeberg is called and is often seen as a separate hill. Here is an area of 80 ha. owned by Het Utrechts Landschap. The is also located on this part of the Grebbeberg. Cycling The eastern slope of the Grebbeberg is popular with sports cyclists because of its gradient. With a maximum gradient of 7% and a gradient of more than 5% for half a kilometer, it is one of the steeper slopes of the Heuvelrug. The west side (over a hundred meters) does not exceed 3% and is much shallower. See also Utrecht (province) References External links Informatie over de Grebbeberg Utrecht (province)