* Mountains: The Puget Sound lowlands are surrounded by mountains on all sides. The Cascade Range lies to the east, the Olympic Mountains lie to the west, and the North Cascades lie to the north. These mountains create a rain shadow effect, which makes the Puget Sound lowlands one of the driest regions in the western United States.
* Forests: The Puget Sound lowlands are covered in dense forests. The forests are home to a variety of tree species, including Douglas firs, western hemlocks, and Sitka spruces. The forests also provide habitat for a variety of animals, including bears, cougars, and bald eagles.
* Rivers and Lakes: The Puget Sound lowlands are drained by a network of rivers and lakes. The major rivers include the Snohomish River, the Skagit River, and the Nisqually River. The major lakes include Lake Washington, Lake Union, and Lake Sammamish.
* Islands: The Puget Sound lowlands are home to a number of islands. The largest islands include Whidbey Island, Bainbridge Island, and Vashon Island. The islands are a popular destination for tourists and residents alike.
* Urban areas: The Puget Sound lowlands are home to a number of urban areas. The largest cities include Seattle, Tacoma, and Everett. These cities are home to a variety of industries, including technology, manufacturing, and tourism.