The correct name of Belgium's actual highest point is Signal de Botrange. It's in the Ardennes Forest, in the far east of the country, about 8 kilometers from the German border (35 km south of Aachen).
Signal de Botrange is the highest point of an extensive plateau known as the Hautes Fagnes (High Fens). It boasts a restaurant and a telecomms tower, which you can climb to say that you stood at 700m above sea level. It's passed by a road, and you can park right at the bottom of the tower.
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