Oklahoma City's city limits extend into Canadian, Cleveland, and Pottawatomie counties, though much of those areas outside the core Oklahoma County area are suburban or rural (watershed). The city ranks as the eighth-largest city in the United States by land area (including consolidated city-counties; it is the largest city in the United States by land area after Houston, whose government is similarly not consolidated with that of a county or borough).
Lying in the Great Plains region, Oklahoma City has one of the world's largest livestock markets. Oil, natural gas, petroleum products and related industries are the largest sector of the local economy. The city is in the middle of an active oil field and oil derricks dot the capitol grounds. The federal government employs large numbers of workers at Tinker Air Force Base and the United States Department of Transportation's Mike Monroney Aeronautical Center(these two sites house several offices of the Federal Aviation Administration and the Transportation Department's Enterprise Service Center, respectively).
Tulsa is a city on the Arkansas River, in the U.S. state of Oklahoma. It’s known for its art deco architecture, mostly in the central Deco District. Landmarks like the Philcade and Philtower buildings reflect a 20th-century construction boom fueled by the prosperous local oil industry. The Philbrook Museum of Art is housed in an Italianate villa that was once the home of a local oil magnate.