Most of the settlements in the Arctic region are confined to rivers or are on the beach, as the waterways — the main means of communication in the area. Also, along the rivers and on the coast quickly find fuel and food, as on the coast have fins, and along the river channel is more common shrub.
The movement of the rivers is dangerous not only because that way because of their extended tortuosity, but rather, because of the possibility of failure. During the Arctic rivers constantly breaks the ice underneath. Snow helps this process, and therefore under the drifts, especially in the cliffs, ice or very thin, or none at all. Where in rivers is shallow, often formed incrustations. Freezing, they form a kind of dam, and the water usually finds a way along the coast, under the drifts or near rocks, driftwood, etc., near which the flow faster. Bends in the river to stay away from steep banks where the current is stronger.
Very often in the river under the ice formed air pockets due to drying after freezing river source. These pockets are dangerous when you walk on the river.
Especially dangerous in the Arctic, the confluence of the rivers. It is often formed eddies that keep water warm longer than in other places, so the transition should be on the ice of the river above the confluence.
Particular care should be taken while driving on the river, covered with thin ice. Dangerous places better address crawling.