Three smaller skeletons can be found in the Inactive Lava Zone, believed to have been killed by some eel-like creature possibly another Grand Demon Leviathan. Grand Demon Leviathan - a descendant of the Gargantuan Leviathan found in the Bone Fields, only two living specimens can be found, one in the Abyss and one in the Inactive Lava Zone.Three large ones make up three huge islands. Island Reefback Leviathan - a larger reefback that has an island, or rocky shell, for a back.Bone Leviathan - the huge leviathan found in the entrance to the Lost River.They can notably be found in the Great Plains and Wasteland biomes. Reaper-Shark Leviathan - a Leviathan created in Alterra labs by splicing the DNA of a Reaper Leviathan and Hammerhead Shark.Ancestral Reaper Leviathan - the ancestor of the Reaper Leviathan, roughly the same size as a Sea Dragon Leviathan.Operations Base Delta - a small Alterra base found wrecked in the Great Plains.Operations Base Beta - a small Alterra base found abandoned in the Mushroom Caves near the Deep Shallows.Operations Base Omega - a small Alterra base found wrecked in the Murky Jungle.This island sits above the Wasteland biome and contains an Alterra Cache and small base as well as part of the Mars IV wreck and one of its Lifepods. Oasis - one of the three Islands that sit atop Reefbacks.Alterra Farm - an Alterra farm located on a floating island above the Murky Jungle.Alterra Food Harvesting Plant - an Alterra farming plant located in the Murky Jungle.Located somewhere in the Great Plains biome Kharra Research Facility - a facility where Alterra is testing on the Kharra virus.It rests on a large Island Reefback over the Great Plains biome. Alterra Regional HQ - the HQ of Alterra operations on 4546B.It was built in "honor" of the crew of the Aurora. Aurora (City) - an Alterra settlement in Sector 2.Many of the buildings seem to have been crushed by some sort of overwhelming force. Void Research Facility - A destroyed complex at the edge of the world, next to the void.Alterra Arctic Cache - a cache found near the base.Arctic Repair Center - Alterra's repair center, abandoned for unknown reasons.Grand Armory - a chunk of the Grand Archives that has been cut off from the rest of the base, the player is asked to secure it for weaponry.It now serves as the headquarters of the Sea Emporers. Grand Archives/Sea Emporers HQ - was where the Precursors stored their data, most of it though has been lost.Unfinished Quarantine Enforcement Platform.Leviathan Observation Center and Hatchery.It is believed that the largest creature in existence could live at the bottom, however all teams sent by Alterra never come back. The Void - the Void is a bottomless biome located on the southern and western edges of Sector 2, it acts as the barrier of the world on those sides and the Arcitc glaciers in the Arctic Zone on the other directions.Only Reaper-Shark Leviathans, Silver Sharks and peepers are a common fauna found here. Wasteland - A biome filled to the brim with harmful radiation, due to the crash of the Alterra freighter, Solarwing recently.Because of the pitch black of the biome you will not see any fauna here, the only thing on the Leviathan that can be seen is its glowing red eyes. One Grand Demon Leviathan can be found here. The Abyss - a pitch black biome that leads from the Forsaken Zone and into the Inactive Lava Zone.Forbidden/ Forsaken Zone - This zone is a dark and deep biome that has many bioluminescent fauna and flora, including: Gabe's Feather, Blood Kelp, Ghost Root, Bloodshroom, Ghost Ray's, Zone Prowlers and the occasional Murky Peeper.This biome houses an entrance to the Forsaken Zone. It consists of a forest housed in some sort of crater as well as the caves below it called the Bone Caves. Murky Jungle - The Murky Jungle is a semi-deep to deep biome that replaces the kelp forests and the Lost River.The Sea Emperors - A group that is opposed to Alterra formed by Ryley and Robin.Their main base in the Great Planes/Sector 2 is located on. Alterra - Alterra has been causing much of the planet harm, they have been experimenting on fauna, flora and destroying ecosystems to build factories and bases.Ryley Robinson - One of the leaders of the Sea Emperors, a rebel group apposed to Alterra.Robin Ayou - One of the leaders of the Sea Emperors, a rebel group apposed to Alterra.Member of the Sea Emperors can be chosen by player to be boy or girl. Charlie Goodall - Protagonist of Subnautica: Frontier.