- Brief Outline of Tosa Washi/Process of Making Washi/Charactaristics of Tosa Washi/A Variety of Tosa Washi Brief Outline of Tosa Washi Paper Handmade Japanese paper is deeply rooted in the Japanese way of life and has been very important in Japan's cultural development. Tosa Province, now Kochi Prefecture, is called Tosa, the Kingdom of Paper . Kochi Prefecture is still Japan's main producing ...www.pref.kochi.jp/~kougyou/triennial/ewashi.htm