인봉 원시림(천연기념물 제189호)은 울릉도에서 유일하게 평지에 위치하며 직경은 약 2km에 달한다.
The Inbong Primeval Forest (Natural Monument No. 189) is the only place on Ulleungdo Island that is located on a flat surface and has a diameter of about 2 km.