Published 2026-06-07 · data 2023 · percent of warm-water coral reefs
Most warm-water corals sit in the danger zone
Bleaching from heat waves hit most reef regions. Recovery slows as oceans warm.
Heat turns coral white before the color on this chart fades. This grid divides coral reefs at risk (2023 snapshot) into colored bands — High / very high risk, Asia & Pacific, and 2 more groups — using equal squares so you compare shares, not country size on a map.
1 cell = 0.1 percent of warm-water coral reefs (0.1% of coral reefs at risk) · 1,000 cells
Context
The 2023 figures from OWID — Coral reefs put High / very high risk at 84% of coral reefs at risk and Asia & Pacific at 8.3% — about 100 percent of warm-water coral reefs in this edition's rounding.
IPCC / Reefs at Risk reanalysis: vast majority of reefs exposed to severe bleaching risk.
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Credit this grid as Inagrid — https://inagrid.com/e/2026-06-07-coral-reef-at-risk