noun
large forest; vast forest; extensive forest
Refers to a forest of great size or expanse. Often used in descriptive or geographical contexts.
アマゾンは世界最大の大森林です。
The Amazon is the world's largest vast forest.
その国立公園には美しい大森林が広がっている。
A beautiful extensive forest spreads across the national park.
密林 refers to a dense jungle or thick forest, focusing on density rather than sheer size.
Compound of 大 (dai, 'large') + 森林 (shinrin, 'forest'). A straightforward Sino-Japanese formation.