nature & planetMongabay

How did these shrines survive a tsunami?

the gist

When the 2011 tsunami devastated Japan's coast, patches of forest were left standing amid the destruction, and many surrounded Shinto shrines. These chinju-no-mori, or guardian forests, had been kept for centuries beside shrines and villages, so dense, mature trees stood where later development had cleared land. Tree trunks and thick root systems can slow and weaken waves and catch debris, though a big tsunami can still overwhelm them. That raises the idea of coastal forests as a natural defence, working alongside seawalls rather than replacing them.

how it works

Trees add friction that slows moving water, and root networks hold soil against scouring. Taller, denser, mature stands do this better than young or sparse planting.

so what

Protecting old forests for spiritual reasons may also have protected communities. It supports a wider push to use living coastal barriers such as forests and mangroves, which also store carbon and shelter wildlife.

fun fact

Shinto shrines often stand within sacred groves, and some forests have been protected for many centuries because of it.

Mongabay · CC BY-ND 4.0

Illustrative photo · Japanexperterna.se, CC BY-SA 3.0, via Wikimedia Commons