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The volcanic rock which has formed in this area can be carbon-dated to between 800 and 3,000 earth years ago.


― PDA, Dialogue


The Lava Castle is a special area within the Inactive Lava Zone. The Alien Thermal Plant can be found inside. The entrance located in the Lost River Mountains Corridor that connects to the ILZ can lead you here.


The Lava Castle is a huge structure of volcanic rock possessing a rather large interior cavern, obsidian pillars, and thermal vents. Various cave systems lead to the center of the castle, which is a large chamber featuring a lava pool with tall spires of rock around its edges. The structure seems to be the breeding grounds of Lava Lizards as it is the only place their eggs can be found. Although the exterior of the Lava Castle was formed naturally, a Data download found in the Alien Thermal Plant suggests that much of the interior was excavated by the Precursor Race.