Lost River

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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 and the Deep Grand Reef.

Description

The Lost River is generally gloomy and foggy, possessing a distinct greenish water tint that is mostly illuminated by acidic brine pools. These pools cover almost all of the lower portions of the caverns. The green brine found throughout most of the cave system will harm the player, but the blue brine found within the Tree Cove is harmless.

The Disease Research Facility is located in the Lost River, inside a cavern.

The Lost River is composed of five distinct areas:  

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Lost River Gallery

• 

  Concept Art "Bones Field"

• 

  Concept Art "Ghost Forest"

• 

  Concept Art of an unknown area

• 

  Concept Art "Ghost Canyon"

• 

  Concept Art "Tree Cove"

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

Future Plans

• Carar-infected fauna will be found in abundance here.

Trivia

• The skeleton in the Bones Field is suggested to be the corpse of a close cousin to the Sea Dragon Leviathan.
• 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).
• The acid damage from the brine may be possible implementation/reference to the "Pillars of Silence" concept art, where enormous jets of acid dot an alien seabed.
• The Ghost Forest was called the "Ghost Trees Chamber" before the Bones Update.