This section of the Snowrunner guide describes how to reach Rift in Taymyr, Russian Federation. This map was added to the game after it launched.
To get there, you have to complete an easy task - Pathfinder in Drowned Lands. It requires you to reach the Northern Road. When entering the Rift, notice that the route to the gate is leading across a very narrow ledge. You need to go across it with a not-too-big and quite maneuverable vehicle.
Activate the Pathfinder task.
The road to the ridge is very narrow.