The Aachener Landgraben is the name of the fortifications along the almost 70 km long border of the former Aachen Empire. The inner or small land moat did not represent a border and only served as an additional defensive bar between the Aachen city forest and the agricultural areas in the south and south-west in front of the city. It branched off just before Alt-Linzenshäuschen at the level of Grindelweg, which in turn is reminiscent of an old control station, north-west and then passed Gut Tönnesrath and Ronheide in the direction of Gut Hochgrundhaus at Von-Halfern-Park. He crossed this and ran north past the former Adamshäuschen watchtower and south past the hamlet of Gut Hasselholz, crossed the Philippionsweg and then climbed a prominent ravine on the edge of the Friedrichswald, which is referred to as the "Alter Landgraben" in the topographical maps. The Landgraben then swung westwards and climbed uphill to the former Beeck watchtower, where shortly afterwards it came across the forest edge of the Vaalserberg and continued to run upwards along its eastern and northern edges. There he met the outer land moat two hundred meters north of the Wilhelmina Tower.