Numaura Wetland located in the southern part of Rishiri Island is a designated Natural Monument of Rishirifuji Town. This wetland along with Otadomari-numa Pond and Minamihara Wetland is selected as one of 500 Important Wetlands in Japan by the Ministry of Environment as Rishiri-to Wetlands.

Communities of swamp plants and alpine plants such as Isotsutsuji (Ledum palustre var. diversipilosum) and northern cranberry are formed. This is also the northernmost boundary of Ezo-tsutsuji (Therorhodion camtschaticum).

The wetland was formed in the explosion crater about 4,000 years ago. The reflected image of Rishiri Fuji on the surface of Otadomari-numa Pond is wonderful.

80% of Japan’s wetlands are located in Hokkaido. With the continuing decrease in the number of wetlands in Japan, Rishiri-to Wetlands are what we must protect and conserve.