Riverbottom is the lowest point in GLMZ that isn't underwater. That distinction matters here more than anywhere else, because the water is always coming. The district sits at the absolute southern terminus of the megacity, where the engineered drainage systems that protect the Meridian Core and the Shelf thin out to nothing. When the lake surges or the spring melt overwhelms the pumping stations, Riverbottom floods first and drains last. The old Altgeld Gardens public housing blocks -- themselves a monument to decades of environmental racism in pre-Meridian Chicago -- were rebuilt as Meridian Residential Block South-9, a name so deliberately forgettable it amounts to erasure. The new blocks are identical modular stacks, six stories of poured composite with neural-compatible wiring and nothing else. No common spaces. No green areas. No pretense.

The environmental justice concerns that defined old Riverdale didn't go away when the neighborhood got a new name. They got a corporate rebrand. Three waste processing facilities ring the district, handling chemical reclamation for the southern industrial zone. The air quality index in Riverbottom regularly exceeds Meridian safety thresholds by 200%, but the thresholds are advisory, not mandatory, and advisories don't apply below Tier 3. Residents have filed 14,000 environmental complaints through the Meridian civic interface in the past decade. The system logs them, categorizes them, and routes them to a processing queue that has never, in its operational history, produced a response.

But Riverbottom endures, the way things endure at the bottom of gravity wells -- not by climbing out but by becoming so dense that nothing can compress them further. The community organizing tradition that existed in Altgeld Gardens survived the transition to Meridian, adapted, and hardened. Block councils operate with military discipline, coordinating flood response, air filtration maintenance, and the distribution of smuggled medical supplies for the respiratory conditions the waste plants cause and the corporate health system doesn't cover. There is a saying in Riverbottom: the water rises, and so do we. It's painted on the side of Block South-9 in letters three stories tall. Nobody has tried to remove it.