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Subnautica Lost River - Location, Entrances, and how to explore

The Lost River isn't just your average biome in Subnautica, it's like stepping into a whole new world waiting to be explored. It's deep, it's risky, and it's filled with valuable resources and secrets crucial to the game's storyline.


Lost River

Subnautica Lost River entrances and location

The Lost River isn't just accessible from one point. In fact, there are four different entrances that you can use to get there, each offering its own unique advantages.

Through this Lost River Entrances Map, you can find the exact positions of all entrances to the Lost River.


Lost River Skull

Blood Kelp Lost River Entrance

The Blood Kelp Zone entrance is relatively safe and easy to reach. To find it, head to the beacon for Lifepod 13, which will lead you to the Mushroom Forest biome. From there, follow a slight northeast bearing until you reach the edge where the Mushroom Forest and Blood Kelp Zone meet. Look for a cave entrance with green brine on its bed - that's your gateway to the Lost River.

The second entrance is also in the Blood Kelp Zone, but it's closer to the Dunes and thus more dangerous due to the presence of Reaper Leviathans. To reach this entrance, head to Lifepod 17 in the western Grassy Plateaus, then head slightly southeast. You'll find a large trench leading to the entrance.


Lost River Entrance

Sparse Reef Lost River Entrance

The third entrance is located in the Sparse Reef, close to the Grand Reef. This entrance is less ideal for a Cyclops due to the presence of Crabsquids. However, if you choose this route, head to the Degasi Base in the Grand Reef and then follow a northwest bearing until you reach the entrance.


Ghost Leviathan

Bulb Zone Lost River Entrance

The last entrance is in the Mountains/Bulb Zone. While it's easy to navigate with a Cyclops, this area is teeming with Reapers, making it a risky choice. To reach this entrance, follow a northeasterly arc from your Lifepod, passing through the Grassy Plateau and the eastern Mushroom Forest until you reach the Bulb Zone. From Lifepod 12, head due north to find the entrance.

How to explore the Lost River

Before you embark on your journey to the Lost River, it's crucial to prepare adequately. Your first priority should be transportation. Given the depth and dangers of the Lost River, a Seamoth with a Depth Module MK3 is a good starting point. However, for a full-scale expedition, a well-upgraded Cyclops, equipped with a Sonar Upgrade, Depth Module MK1, and a docked Prawn Suit with a drill arm, is recommended.



Next, you'll need supplies and personal equipment. Consider installing a grow bed in your Cyclops to grow Marblemelons, ensuring a steady supply of food and water. A Reinforced Dive Suit, a Stasis Rifle, and a Repair Tool are also essential for your safety and survival.


Cyclops Growbed

Important tips to explore the Lost River

The biome is filled with a green brine that is harmful to the player but safe to traverse in a vehicle. The Lost River is home to unique flora and fauna, including the Ghost Leviathan Juvenile and the River Prowler.


Thermal Vent

The Lost River also contains several points of interest, such as the Lost River Laboratory, the Disease Research Facility, and the Giant Cove Tree. The biome is rich in resources, including large deposits of Nickel Ore, Crystalline Sulfur, and Uraninite.



Remember, the Lost River is a dangerous place. Always keep an eye on your oxygen levels, vehicle health, and the creatures around you. It's easy to get lost in the depths.