Krasnogorje

Krasnogorje is a mountainous area near Groznyj Grad, seen in Metal Gear Solid 3: Snake Eater. It is divided into several areas:

Tunnel
The tunnel contains a very tall ladder leading up from Sokrovenno to the mountains. As Snake climbs, the Snake Eater theme song can be heard playing in the background.

Mountain Base
The air is thinner as Snake ascends to higher altitude, which results in his stamina depleting more quickly than usual. Many vultures fly around here, and will attempt to eat any dead guards.

Mountainside
If Snake didn't sabotage it at Bolshaya Past, the Hind B helicopter will fly around this area, otherwise there will be flying platforms. Several anti-aircraft installations along the cliffs can be used to shoot it down. An RPG-7 can be found in the armory along the hillside. There's also a provisions storehouse.

Mountaintop
The mountains gets high enough for small snow deposits to form. There are several trenches lining the area, and another Hind menaces Snake as he passes through.

Snake meets up with EVA at ruins atop the hill where she supplies him with a key to the tunnel leading to Groznyj Grad. Behind the ruins is a scenic vista overlooking the military base. As EVA returns to base in her motorcycle, Snake scopes out the facility and spots Volgin lethally torturing Granin in an oil drum, wondering if he was the spy helping Snake. Volgin finds a transmitter placed in Granin's shoes that he shows to Ocelot, and suspects the spy may have planted it there to track him.

After returning to mountaintop, Snake must evade flame troops to reach the entrance tunnel to Groznyj Grad.

Trivia

 * According to EVA, the name means "the red mountain ridge" in Russian.
 * At the vista behind the ruins, Snake can fire on the military base, causing them to go on alert and sending an attack helicopter.
 * If vultures attempt to feed on any dead guards, you'll later see their spirits being harassed by a vulture during The Sorrow battle.