The Peñón-Texcoco Highway leads to the entrance of the offices managing Lake Texcoco's federal terrains. A guard stands behind blue railings; behind these, a single-story building stands: ample, horizontally expanding throughout the terrain in its enormous, empty interior spaces. The Mexican Center for Education in Water and Sanitation, which is the name given to this building, is also, in a certain sense, the heart of the federal lake’s terrains: its administrative heart, its political heart, and the only place legitimately occupied by humans. Within its structure a group of people gathers to work; they differ radically from other groups that occupy neighboring zones, east of this territory: the Lake Texcoco terrains separate the inhabitants of ejido rural properties from the dense, urbanized weaving of Mexico City. [...]