1911 Encyclopædia Britannica, Volume 15… (1911)
“ They lie entangled in a vast net of sea-weed; are the resort of innumerable birds, and used to be largely frequented by seals and sea-otters, which, however, have been almost completely driven away by unregulated hunting. Near the south-eastern coast of Kunashiri stands a mountain called Rausunobori (3005 ft. high) , round whose base sulphur bubbles up in large quantities, and hot springs as well as a hot stream are found. On the west coast of the same island is a boiling lake, called Ponto, which deposits on its bed and round its shores black sand, consisting almost entirely of pure sulphur. ”
