Kumi Coast is located in between the river bed in front of the village in Kumi (Funaoroshi) and Candle Rock Lookout. There are two different locations with unusual plants here. Crammed into the small space of Funaoroshi you can find subalpine plants Japanese arborvitae (Thuja standishii), and O-iwa-kagami (Schizocodon soldanelloides var. magnus), the montane plant Mongolian oak (Quercus mongolica var. grosseserrata), the northern species painted maple (Acer mono), the southern species Japanese pittosporum (Pittosporum tobira), and the continental species Mitsuba-iwagasa (Spiraea blumei var. obtusa) and Yokogura-no-ki (Berchemiella berchemiaefolia).
On the coast you can see a remnant plant from the glacial age, Shiro-uma-asatsuki (Allium schoenoprasum var. orientale), the southern species Sharin-bai (Rhaphiolepis indica var. umbellate), Japanese pittosporum (Pittosporum tobira), and the continental species like Daruma-giku chrysanthemum.
The reason for this unusual combination of plant species is not fully understood. However, the places where these unusual combinations are seen around Oki are also commonly where the geology is composed of alkali rhyolite. This indicates that there may be a relationship between the plant distribution and geology.