the thousand rice fields of akiyoshi cave

adventure akiyoshi akiyoshido akiyoshidou ancient asia cave cavern chimachida dam dark destination dripping dripstone earth factory fields flowstone formation geology hanging highlight historic honshu inside japan japans karst kasazukushi largest limestone mine monument mystic natural nature park rice rimstone rock scenic science shine solutional special speleology speleothem spotlights stalactite stalactites stone thousand time tourist umbrella underground view water yamaguchi