The forested Harplage is located in the district of Hildesheim in the southwestern part of the Innerste Uplands, a northeastern range of the Lower Saxon Hills and borders on the Ambergau to the west. It rises between Bockenem to the east-northeast and Lamspringe to the southwest. The ridge lies east of the valley of the River Lamme and west of the Nette valley between the northern part of the Ambergau to the north, the southern half of the Ambergau to the south-southeast and the ridge of Heber to the south. A few kilometres away is the ridge of Hainberg northeast of the Nette valley and somewhat southeast of this river are the northwestern foothills of the Harz.