Land-fæsten

According to the Old English Dictionary:

es;

land-fæsten

n. A land-fastness, a strong military position on land, a pass :-- Leoniða on ánum nearwan londfæstenne him wiðstód Leonida in angustiis Thermopylarum obstitit, Ors. 2, 5; Swt. 80, 14. land-fæsten