The TerReForm base for the Central American isthmus was Magdalena. This was a large island in about the same place as the former Islas Marías. Pre-Zero, this had been an archipelago off the west coast of Mexico, somewhat south of the tip of Baja California. The Hard Rain had reforged it into a single island with a few rocks and reefs scattered around, useful for propagating life that was designed to occupy shallow water and tidal zones. The lack of a moon meant that New Earth’s tides were caused entirely by the gravity of the sun, which made them weaker and more closely synchronized with the cycle of night and day. Because tidal zones were thought to have disproportionate importance to the ecosystems of land and sea alike, much TerReForm brainpower had been focused on them, and the low-lying banks of wave-washed rubble around Magdalena had become spawning grounds, not just for fish and birds and crustaceans, but for researchers with advanced degrees. Doc himself had spent ten years of his life here, sloshing through tide pools with buckets and shovels.