Arboretum

Arboretum is a room in the Chozo Ruins region of Metroid Prime.

Secret World

Utilize Ice Spreader here to expose the invisible root we'll be jumping too. Use your first jump for distance, then your second one for height. If you land on a standable edge, then just use another Ice Spreader shot/multitude of Power Beam shots to find out the part that sticks furthest out. Jump to the very edge of it, it's the only standable part. Jump through the ceiling out of the level now.
This was secret world #10 in the original numbering scheme.