envMap metalness

I created the terrain using MeshPhongMaterial.
After applying envMap, it was applied successfully.
However, it is highly reflective. How to lower the reflection value?

before

after

MeshPhongMaterial has a reflectivity option

You can see it working on the official example at MeshPhongMaterial – three.js docs (threejs.org)

Assign the envMap, and then slide the reflectivity option.

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thank you for your answer