The Thüster Berg lies within a triangle formed by the villages of Eime, Duingen and Salzhemmendorf in the western half of the Leine Uplands, which itself is in the northern part of the Lower Saxon Hills. It is about long and its highest peak is the Kanstein. It lies between Hemmendorf and Oldendorf in the north, Ahrenfeld, Deilmissen and Deinsen in the south, Marienhagen in the southeast, Weenzen and Thüste in the south, Levedagsen and the Domäne Eggersen in the west and the village of Salzhemmendorf to the northwest.