천연기념물이 · 천연기념물을
natural monument (a legally protected species, plant or site)
Example
진돗개는 한국 정부가 보호하는 천연기념물이에요.
The Jindo dog is a natural monument protected by the Korean government.
Word parts
천 heaven+연 so+기 record+념 remember+물 thing
Literally 'natural thing to remember'; a legal status for protected animals, plants and places.
Good to know
Pronounced [처년기념물]: the ㄴ batchim of 천 links to 연.