Since the early 17th century, Wakayama Prefecture — with its scarcity of paddy fields and abundance of hillside terrain — has cultivated citrus instead, accumulating over 400 years of history. Centered on the Arida River basin, the region has given rise to nationally leading brands such as “Arida Mandarin.” The warm climate, ample sunshine, and terraced stone-walled hillsides that both retain heat and ensure drainage have produced thin-skinned, seedless, high-sugar, low-acid Unshu mandarins and numerous other premium varieties with excellent storage and transport qualities.
Ehime Prefecture stands alongside Wakayama as one of Japan’s two great citrus powerhouses. The hilly terrain of the Matsuyama Plain and the Seto Inland Sea coastline have nurtured mid-to-late-season varieties with distinctive flavors — including “Iyokan” and “Kiyomi” — that complement Wakayama’s season and together sustain Japan’s year-round citrus supply chain.
This study tour takes “6th-industry integration” (1st × 2nd × 3rd) as its central theme, walking participants through the four key nodes of brand, cooperative, processing, and retail channel — fully decoding how Japan’s citrus industry has transformed a basic agricultural commodity into a high-value-added national brand.