Note 5 — Chapter VII · Camps, Fortifications, Vitrified Forts; Santorin; The Towns upon the Hill of Hissarlik.

Limburg also contains some defensive works, many centuries old, which are as yet but little known. We may mention amongst them the so-called dyke of Zeedyck, near Tongres, a formidable intrenchment some 2,186 yards long by more than 325 feet wide at the base, and of a height varying from 49 to 65 feet; the earthen ramparts of Willem on the Geule, the not less important ones of Houlem, with many others far away from the great highways of communication, but within the limits of the two provinces of Liège and Limburg.5