Wakayama, ken (prefecture), west-central Honshu, Japan. It occupies the southwestern and southern portions of the Kii Peninsula, which faces the Kii Strait (west) and the Pacific Ocean (south). Wakayama city, on the Kii Strait, is the prefectural capital.
Most of the prefecture’s area is mountainous and broken by deep river valleys, such as the Toro Gorge on the Kumano River. Despite frequent typhoons in summer, the climate is mild, and the coastal plain and some large valleys are rich agricultural regions. Fishing for tuna, bonito, mackerel, and sardines has been carried on along the coast since early historic times. Industrialization is confined largely to the northwest, where the city of Wakayama and neighbouring Kainan are part of the Keihanshin Industrial Zone. Those cities’ major products include petrochemicals, textiles, iron, and steel. A thermoelectric plant began operation near Kainan during the early 1970s.
Wakayama prefecture is also a major tourist area, with attractions including the seascape, beaches, hot-spring resorts, and Shintō shrines and Buddhist temples. Nachi-Katsuura, in Yoshino-Kumano National Park, is a tourist centre located near hot springs and the Nachi Waterfall. The town of Taiji is considered the birthplace of Japanese whaling and contains a whaling museum. Mount Kōya, in the northern part of the prefecture, is crowned by a Buddhist temple complex, monastery, and extensive cemetery founded in the 9th century ce; it is one of several locations in the Kii Mountains collectively designated a UNESCO World Heritage site in 2004. A university was established in Wakayama city in 1949. Area 1,825 square miles (4,726 square km). Pop. (2010) 1,002,198.