Lost River

This seems new This article contains information that is updated for the latest Experimental Version of Subnautica. Players using stable mode may find this information inaccurate.

Terrain scans indicate this biome contains unusually high concentrations of organic and fossilized remains.

― PDA, Dialogue

The Lost River is an in-development biome. It is a massive, frigid cavern system located deep under the surface.

Entrances to the Lost River can be found in both Blood Kelp Zones, the Dunes, the Deep Grand Reef and via the Inactive Lava Zone corridor found in the Dunes.

Description

The Lost River is generally gloomy and foggy, possessing a distinct greenish water tint that is mostly illuminated by brine pools. These pools cover almost all of the lower portions of the caverns.

A Precursor Base can be found here.

The Lost River is composed of four distinct areas: 

Bones Field

The Bones Field is a vast cavern within the Lost River, where a massive skeleton of an unknown fauna can be seen laying. It connects to the first Blood Kelp Zone, through passages, each of them having its own flora and particular landscape, and also the Ghost Canyon.

Ghost Canyon

The Ghost Canyon is a huge passage featuring multiple caves and tunnels branching out from one main canyon. This serves as an entrance to the Lost River from the Deep Grand Reef and connects to the Bones Field from the south.

Ghost Trees Chamber

A large chamber lead from the main entrance of the Lost River (located in the second Blood Kelp Zone). This area is filled with whitish glowing blobs and dark brown giant Ghost Trees, and is also the starting point of the brine river. From there, the player can either go straight forward into the Bones Field, or turn right to enter the Tree Cove.

Tree Cove

The Tree Cove is a large cavern within the Lost River. The brine river forms a large lake there, with the luminous Giant Cove Tree in its center. One end opens to the north tunnel leading to the Bones Field, and the other a corridor to the Inactive Lava Zone.

Resources

• Deep Shroom Spore
• Sulphur
• Uraninite Crystal

Fauna

• Ghostray

Flora

• Cove Tree
• Deep Shroom

Confirmed Future Fauna

• Blighter
• Crabsquid
• Spine Eel
• Spinefish

Gallery

• 

  "Bones Field"

• 

  "Ghost Trees Chamber"

• 

  Concept Art of an unknown area

• 

  "Ghost Canyon"

• 

  "Tree Cove"

For a more complete gallery, visit Lost River/Gallery.

Future Plans

• The Lost River is planned to be about 700 to 1000 meters deep when finished.
• The Secondary Bio-Research Facility will be implemented in the Lost River.

Trivia

• The Lost River is inspired by real life brine pools.
• The skeleton in the Bones Field is suggested to be either the corpse of a Sea Dragon Leviathan or a close cousin to it.
• Like other segmented biomes (such as the Inactive Lava Zone), the Lost River's technical data divides it into the LostRiver_TreeCove, LostRiver_BonesField and LostRiver_TreeCove again for the Ghost Canyon (this aids the AI in deciding music tracks, random events and creature behaviour).