Tokushima is located in the eastern part of Shikoku. The east coast faces Kii Channel while southeast faces the Pacific Ocean. Many mountainous areas of 4,146.67 square kilometers’ accounts for approximately 80% of total area. There are many mountains with peaks beyond 1,000 meters. The highest mountain in Tokushima is Mt. Tsurugi with 1,955-meter peak, which is the second largest mountain in Shikoku. Mt. Tsurugi at the center, divides the prefecture into North and South. Flowing from the north side, Yoshino River, originating from far away Kōchi Prefecture passes through Oboke and Koboke canyons then turns east from Miyoshi City. As the eastern flow gets wider, a wedge-shaped Tokushima plain is formed.
In the north of the Yoshino River, Sanuki mountain ranges are generally lower. In the foothills of the mountain, delta is developed and the low downstream of Yoshino River along with Katsuura River and Naka river is used as rice fields.
Many streams of rich water sources such as Yoshino River, Katsuura River, Naka River flow out from the mountain area.
Tokushima prefecture is largely divided into two major climate zones. The northern part (especially northwest) belongs to Setouchi climate while the southern part belongs to Pacific climate. Northern part has minor rainy season on a nationwide scale, but the southern part has major rainfall season that holds the daily rainfall record in Japan.