Chyornyj Prud

Upon entering Chyornyj Prud from Rassvet, explore the southern shore to find two new snakes: Snake D (Coral Snake), which can poison you, and Snake E (Milk Snake), which is harmless.

Enter the water on the western side to find item pickups: AK-47 Ammo, a White Phosphorus Grenade, and a Smoke Grenade.

Locate Frog C (Poison Dart Frog) skimming on the water's surface. Eating it will poison you but is required for a trophy/achievement.

Head to the northeastern corner. In the shallow water, find a Chaff Grenade and the GA-KO Uniform on the ground. The GA-KO Uniform allows you to hear uncollected Kerotan/GA-KO doll calls.

Near the northeastern exit, look around the corner by the northern tip of the map for a large tree. Shoot GA-KO 12 from a branch.

Dive underwater at the base of the same tree to find and shoot Kerotan 12.

West of the tree, collect M1911 ammo and a Stun Grenade. You'll see another item on an unreachable ledge.

Swim west towards a large log blocking a path. Swim underneath it.

On the other side, kill and eat Fish C (Arowana) swimming there.

On dry land, collect a Grenade and Mk22 ammo if needed.

Head north but do not take the exit yet. Be cautious of a pitfall trap near the northwestern exit that causes a game over.

Find a climbable tree in this northern section. Climb it and hang from the connected wire. Shimmy across to another line below.

Aim for the second line, drop from the current one, and mash the interact/action button to grab the second line. If you fall, return to the tree and try again.

Once on the second line, head across to reach the previously unreachable item on the higher ledge: the Crocodile Cap, which helps fool guards in water.

Make your way to either exit. Be aware of the pitfall trap near the northwestern exit and a trip-wire trap at the northeastern exit. You can crawl under the trip-wire or shoot it to trigger a falling spiked log.

Take either exit to proceed to Bolshaya Past South.