Package: Hallelujah Mountains (AKA Cloudlands)
Love the floating islands! It's a shame they don't have any trees on as in the depicted picture (I'm also running ethereal, if that matters), but they are cool all the same.
It's a problem on Ethereal. Ethereal limits both its biomes and the trees that grow in them by altitude, there's a discussion of barren Ethereal Cloudlands here