Path of Roots
The Part of Roots is a room in Torvus Bog. Most of the room is underwater.
The room is first entered underwater from the Lagoon. The room is open except for a cylindrical structure in the center. To get around this, Samus must use the Morph Ball to roll underneath. On the other side, there are a series of platforms leading above water. The door to the Great Bridge is at this above-water area.
If Samus returns with the Grapple Beam, she can use a Grapple Point to go across the water from the west side of the room to the top of the cylinder, where a Missile Expansion can be found. An entry of Luminoth Lore can be found on the wall in a hologram.
The underwater portion is inhabited by a swarm of Hydlings. On the platform where the Missile Expansion is found are a group of four Shriekbats, which take up residence after Samus defeats the Boost Guardian.