As of today, in season, building toward peak (~September 25). Earth Exhibit tracks the live conditions and flags it the moment it is on.
The Asagi-madara (アサギマダラ) undertakes long-distance seasonal movements along Japan's coasts and islands.
Individuals travel between subtropical wintering areas and temperate breeding grounds, producing concentrated daily passages at capes and island shorelines during spring northward and autumn southward migrations.
Where to see it
A taste of where to see it. The full map, exact coordinates and the best timing for each spot live in the app.
| Viewing spots |
|---|
| Cape Hedo (Hedo Misaki) |
| Kume Island Coastal Ridges (Kumejima) |
| + 2 more spots, with exact coordinates and timing, in the app → |
This is the short version
This page shows a taste. The app has the full list of where to see this, the exact timing, and live conditions for 1,000+ natural phenomena worldwide, so you know the moment one is genuinely worth the trip.