The Koishikawa Bontanical Gardens cover an area of 16 hectares of botanical gardens by the University of Tokyo Graduate School of Science. Located in Hakusan Bunkyo-ku Tokyo. Access: http://www.bg.s.u-tokyo.ac.jp/koishikawa/eng/ Homepage; http://www.bg.s.u-tokyo.ac.jp/koishikawa/eng/e.html　A particulaticular Japanesee specimen is for example the "Saru suberi" tree with a bark that is very smooth and supposedly makes the monkeys slip as the name says.