66 million years ago, an asteroid struck here, creating a multi-ring impact basin buried under 1 km of limestone. The impact fractured bedrock in concentric zones: an inner peak ring at 80 km, a crater rim at 180 km, and an outer basin reaching 260 km across. The most visible signature is a 165 km semicircle of cenotes tracing the primary fracture zone — but satellite imagery reveals the entire Yucatan landscape is shaped by rings within rings: concentric dissolution patterns, fracture-controlled wetlands, and karst features organized at multiple radii from the impact center.