is a southwestern-central U.S. state located in the Great Plains region. Spanning a total area of 69,899 square miles (181,037 square kilometres), Oklahoma is home to an estimated population of 3,959,353 people, with estimates predicting a population of 4,019,800 by 2022. The state capital is Oklahoma City, which is also its largest city.
Oklahoma borders Colorado, Kansas, Missouri, Arkansas, Texas and New Mexico. The Red River forms the majority of its southern boundary, while the Arkansas River flows across northeastern Oklahoma. The highest point in the state is Black Mesa at 4,973 feet (1,516 metres).
Agriculture and petroleum production have historically been key elements of Oklahoma's economy, though mineral products such as natural gas, petroleum, coal and stone are also important economic contributors. The state's cultural heritage is reflected in its numerous Native American and cowboy museums. Additionally, a barge system links Tulsa - Oklahoma's second largest city - to the Gulf of Mexico.
Oklahoma is also known as the 'Sooner State', a nickname derived from settlers who entered the territory before it was legally opened. Its state motto is “Labor Omnia Vincit”, meaning "Labor Conquers All Things". The state bird is the scissor-tailed flycatcher and the wild turkey, while the state flower is the Oklahoma hybrid rose, American mistletoe and Indian blanket. The state song is “Oklahoma!”. There are five seats for Oklahoma in the U.S. House of Representatives, out of 435. The time zone for the state is Central, GMT −6 hours.