The description for the final episode on cbs.com confirms that the entire final leg will take place in Alaska. Here is the description below:
Sunday, January 20th, 8:00pm et/pt
The Final Push
In a final Amazing Race leg unlike any homestretch before it, the Racers are surprised to learn upon checkout that their next flight is their last for the entire race: the entire leg, all the way through the finish line, will play out in the city, the wilderness, by the ocean, on glaciers, and in the national parks of Alaska.One often combative Team comes together, while one usually cohesive Team clashes.
One Team misreads a vital clue. Will this lead to the Team's downfall?
After 10 cities, 4 continents, and nearly 30,000 miles, who will cross the finish line first and win the one million dollar prize?