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Share of the municipality covered by designated flood-inundation hazard areas (largest-assumed scale). Areas outside the zone are not risk-free.
In 2024, Okawa-shi, Fukuoka recorded the highest Flood-hazard area share (100%) and Higashinaruse-mura, Akita the lowest (0%) among 1,896 municipalities in Japan. The national average is 5.77%. Source: MLIT National Land Numerical Information — A31a Flood Inundation Assumed Areas (maximum-scale scenario).
Showing 1,896 of 1,896
▲ The top 5 are tinted sky, ▼ the bottom 5 amber. Ties share a rank (standard competition ranking).
The same metric at prefecture level lives at /ranking/muni_flood_inundation_area_share. For each municipality’s trend and detail, open its page from the municipality index.
Note: trend charts live on each municipality page (/municipality/{code}). This page does one thing — line up the whole country on a single axis.