Wood from Yamaguni-go (Keihoku Yamaguni and Kuroda area) were once carried downstream by the Katsura-gawa River and landed at Saga or Umezu for transportation to Kyoto.
かつては山国郷（京北山国・黒田地区）の木材が桂川を下り、下流の嵯峨・梅津などで陸揚げされて京都に運ばれた。