Wakayama Pref. boasts the largest production of mandarin oranges in Japan. Among them, Arida City, which has a history and tradition of over 400 years, is nationally famous for its sweet and delicious “Arida mandarin oranges”.

The mandarin orange cultivation in the Arida region is a traditional agriculture that has been passed down for over 400 years in a natural environment with many mountain forests and few harvests from flat fields. It is considered one of Japan's agricultural heritages. The terraced mandarin orange fields along the Arida River, especially those near the summit of Yamadahara, provide a picturesque view during the harvest season when the mountains turn orange and offer a splendid panoramic view of the Arida River estuary and Arida City.