Japan, Kumamoto
Along the rim of the world's biggest caldera, grassland and long fast sweepers.
Length
45 km
In miles
28 mi
Driving time
1 hr 24 min
Atlas rating
9.2 / 10
The run
Ozu to Aso, following the Prefectural 339. Drive it in either direction, though the views usually favour the climb.
Season
Fog on the caldera rim, volcanic closures near the crater
Checked by the Drivers Atlas desk
Scored and written by the Drivers Atlas editorial desk, drawing on driven routes across the UK and Europe, mapping data and member road reports. Every road in the library carries a driving and scenery score set by the same method. How we score roads.
Last reviewed 31 May 2026
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