Tarmstedt is a municipality located in the district of Rotenburg within the state of Lower Saxony, Germany. Geographically, it is positioned approximately 25 km northwest of Rotenburg and 25 km northeast of the city of Bremen.
The municipality serves as a local administrative area situated in the northern region of the country. It is characterized by its proximity to these major regional hubs while maintaining its status as a distinct municipal entity within Lower Saxony.