 the high fens (; ; ), which were declared a nature reserve in 1957, are an upland area, a plateau region in the province of liÃ¨ge, in the east of belgium and adjoining parts of germany, between the ardennes and the eifel highlands. the high fens are the largest nature reserve or park in belgium, with an area of ; it lies within the german-belgian natural park hohes venn-eifel (), in the ardennes. its highest point, at  above sea level, is the signal de botrange near eupen, and also the highest point in belgium. a tower  high was built here that reaches  above sea level. the reserve is a rich ecological endowment of belgium covered with alpine sphagnum raised bogs (not "fens" as the name would imply) both on the plateau and in the valley basin; the bogs, which are over 10,000 years old, with their unique subalpine flora, fauna and microclimate, are key to the conservation work of the park.{{cite book|author=george mcdonald|title=frommer's belgium, holland and luxembourg|url=http://books.google.com/books?id=f9l7tcmvimoc&pg=pa250|accessdate=2 june 2011|date=26 april 2011|publisher=john wiley and sons|isbn=978-0-
Geographical,_historical_and_cultural_areas_of_Belgium Geography_of_Belgium Geography_of_LiA"ge_(province) Mountain_ranges_of_Europe Rhenish_Massif Wallonia\'s_Major_Heritage Wetlands_of_Belgium Wetlands_of_Germany