樹海

• Reading: じゅかい
• Romaji: jukai
• Kanji breakdown: 樹 (ju/ki) — tree, plant; 海 (kai/umi) — sea, ocean
• Pronunciation: /dʑɯ.ka.i/

Meaning

Sea of trees; an expanse of dense, primeval forest so vast it resembles an ocean when viewed from above.

A poetic compound noun most famously associated with the Aokigahara forest (青木ヶ原樹海) at the base of Mount Fuji, known for its extremely dense woodland and volcanic rock that reportedly affects compass readings. The word captures the overwhelming, ocean-like scale of dense woodland, and is also used more broadly for any vast, unbroken forested landscape.

Examples

1. 富士山を背景に広がる青木ヶ原樹海は、息をのむほどの絶景だ。 The Aokigahara forest spreading out against the backdrop of Mount Fuji is a breathtaking sight.
2. 樹海の内部では木々が密集しているため、方向感覚を失いやすい。 Inside the sea of trees, the dense concentration of trunks makes it easy to lose one's sense of direction.
3. 上空から眺めると、その樹海がいかに広大であるかがよく分かる。 Looking down from above, one can truly appreciate how vast that sea of trees is.

Usage Guide

Context: nature, geography, tourism, literature

Tone: literary

Origin & History

Compound of 樹 (tree, plant) and 海 (sea, ocean). The metaphor compares the canopy of a vast, continuous forest to the surface of the sea — boundless and overwhelming in scale.

Cultural Context

Era: Modern

Generation: All ages

Social background: Universal