This document provides an overview of physical geography in the United States, summarizing key geographic features such as mountains, rivers, lakes, climate regions, and national parks. It notes that Denali in Alaska is the tallest mountain, the Mississippi River is the longest and deepest river, the Great Lakes are the largest lakes, and Death Valley is the lowest and hottest point in the country. Several national parks are also highlighted, including Yellowstone, the first national park, and Arches National Park in Utah.