Much of Alaska is covered by

the Alaska Range and the Brooks Range

Explanation:

Alaska is a federal state in the United States. It is actually the largest state of this country, and it is also the northernmost state. All of Alaska lies on very high latitude, thus it has very cold climate for much of the year.

Big portion of the landscape of Alaska is covered by two mountain ranges. These mountain ranges are the Alaska Range and the Brooks Range. Both ranges have a roughly west to east direction.

The Alaska range is located in the southern and southeastern part of Alaska. It alleviates immediately from the coastline. It separates this part of the country and the lowlands of the interior.

The Brooks Range is located between the central part of the state and the norther part of the state, being a natural boundary between the two parts. This range lifts high up between the lowlands in the interior, and the lowlands in the northern part of the state.