Located between Alaska and Yukon Bay in Canada, Hubbard is one of the largest glaciers in the world. It stretches 7.5 miles in length and moves as fast as 100 feet per day. It is also the largest tidewater glacier in North America. It has been advancing toward the Gulf of Alaska since it was first mapped 1895. Huge chunks of ice crash into Yukon Bay creating a thunder like sound called 'white thunder'.