Albert Barnes Commentary Psalms 80:10

"The mountains were covered with the shadow of it, And the boughs thereof were [like] cedars of God." — Psalms 80:10 (ASV)

The hills were covered with the shadow of it - That is, it made a shade, by its luxuriant foliage, on the hills in every part of the land; it seemed to cover all the hills.

And the boughs thereof were like the goodly cedars - Margin, as in Hebrew, “cedars of God”; that is, lofty, majestic cedars. See the notes at Psalms 65:9. The reference here is to the cedars of Lebanon, among the most majestic objects known to the Hebrews.