Koshu Valley is the informal name for the main wine-producing area of Japan, a valley extending around the town of Koshu in the eastern part of Yamanashi Prefecture. The area comprises the towns of Koshu, Yamanashi and Fuefuki, collectively known as the "Kyoutou Region" (峡東地域). An alternative name for the area is the "Kyoutou Wine Resort" (峡東ワインリゾート), translated into English as the "Yamanashi Wine Resort" to avoid confusion with the city of "Kyoto" which has a similar pronunciation.
The valley, including some of the surrounding mountains, covers 756 square kilometers. It constitutes the largest grape producing area in Japan and has the highest concentration of wineries in the country, making it the leading producer of Japanese wine, especially from the Koshu grape.
- "Koshu Valley Wine Country". Koshu Valley. Retrieved 2019-05-26.
- "Koshu Wine: A 1300-Year Journey" (PDF). Close to Mount Fuji. Retrieved 2019-05-26.
- "峡東地域とは (About the Kyoutou Region; Japanese only)". Yamanashi Prefecture. Retrieved 2019-05-26.
- "Yamanashi Wine Resort". Yamanashi Wine Resort. Retrieved 2019-05-26.
- "Kyoto Area in Yamanashi (Japanese only)". Yamanashi Wine Resort. Retrieved 2019-07-23.
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