noun
primeval forest; virgin forest
Refers to a forest that has remained largely untouched by human activity, in its natural state. Often used in ecological or geographical contexts.
See also: 原生林 (げんせいりん)
この地域には広大な原始林が残っている。
A vast primeval forest remains in this region.
Compound of 原始 (primeval, primitive) and 林 (forest). The term is straightforward and its meaning is transparent from its components.