At an altitude of roughly 513 meters, the Kunimigaoka Viewing Platform offers the best views in the Takachiho Basin. Visitors can see Mount Aso to the west (the five peaks of Aso), the Sobo Mountain range to the north, and the Takachiho Basin to the east. This spot actually earned a star for the fantastic views that it offers in the world famous travel guidebook, the Michelin Green Guide Japan.
Here you can see a sea of clouds in the early morning if the conditions are right between late September and early December. The ideal conditions are a chilly, windless morning on a clear day. The sunrise viewed from Kunimigaoka is also beautiful, and worth getting up early for. 
Legend has it that the grandson of Emperor Jinmu, Takeiwatatsu-no-mikoto, viewed the country (“kunimi”) from this spot, and there are several stone statues commemorating this.