This paper focuses on maps as a technology of Empire in 19th century Qing Mongolia. The production of geographical information was a fundamental dimension of the Qing Imperial rule in Inner Asia, which involved a complex negotiation process between the imperial center and local Mongolian populations. This study examines one of the mapping projects initiated by the Qing state in Khalkha Mongolia (1805) and explores the tensions that arose between the central officials, the league heads who acted as power-brokers, and the Mongol local actors who were put in charge of drawing maps and setting boundary-markers (oboos) between banners. In their attempt to consolidate the state power over Khalkha Mongolia, the Qing imperial rulers sought to impose a spatial ideology premised upon fixed and linear boundaries, which required profound modifications to the physical geography of the steppe. However, the Mongol local leaders advocated for their indigenous territorial organization and challenged the frameworks imposed by the state while the league heads had to act as mediators. Authors have portrayed the position of league heads as devoid of real power, or mere transmission belts between the imperial residents and local leaders. This project leads us to rethink their role in the administrative structure of Qing Mongolia, as they became the main actors in the territorial transformations of Mongolia. Ultimately, I argue that the Qing strategy of relying on power-brokers, who were made responsible for the implementation of new technologies of governance, is a shared feature between empires of the early modern world.