Arkansas is a land of mountains and valleys, thick forests and fertile plains. The so-called Lowlands are better known by names of their two regions, the Delta and the Grand Prairie. The Arkansas Delta is a flat landscape of rich alluvial soils formed by repeated flooding of the adjacent Mississippi. Further away from the river, in the southeast portion of the state, the Grand Prairie consists of a more undulating landscape. Both are fertile agricultural areas.

The Delta region is bisected by an unusual geological formation known as Crowley's Ridge. A narrow band of rolling hills, Crowley's Ridge rises from 250 to 500 feet (150 m) above the surrounding alluvial plain and underlies many of the major towns of eastern Arkansas.

Northwest Arkansas is part of the Ozark Plateau including the Boston Mountains, to the south are the Ouachita Mountains and these regions are divided by the Arkansas River; the southern and eastern parts of Arkansas are called the Lowlands. All of these mountains ranges are part of the U.S. Interior Highlands region, the only major mountainous region between the Rocky Mountains and the Appalachian Mountains. The highest point in the state is Mount Magazine in the Ozark Mountains; it rises to 2,753 feet (839 m) above sea level.

Arkansas is home to many caves, such as Blanchard Springs Caverns. It is currently the only U.S. state in which diamonds are mined.

Buses are an intrinsic part of everyday life, and play an important part in the social fabric of many countries. Many urban public transportation systems rely on bus services. The largest single city bus fleet in North America is in New York City.

Bus services can fit into several broad classes. Local transit buses provide public transit within a city or one or more counties, usually for trips of only a few kilometers. Intercity, interstate or interprovincial buses provide transit between cities, towns, rural areas and places usually tens or hundreds of kilometers away. They generally provide fewer bus stops than local bus routes do. Trailways Transportation System is an example of US interstate bus systems. Some local transit systems offer bus lines to nearby cities or towns served by another transit agency. Intercity bus services have become an important travel connection to smaller towns and rural areas that do not have airports or train service.

Some public transit bus systems offer express bus service in addition to local bus lines. Local lines provide frequent stops along a route, sometimes two or more per kilometer, while express lines make fewer stops and more speed along that route. For example, an express bus line may provide speedier service between a local airport and the downtown area of a nearby city.

Shuttle bus service provide transit service between two destinations, such as an airport and city center. Shuttle bus services are often provided by colleges, airports, shopping areas, companies, and amusement destinations. Tour bus service shows tourists notable sights by bus. City tour buses often simply pass by the sites while a tour guide describes them. Longer distance tour coaches generally allow passengers to disembark at specific points of interest. Some tourist buses are decorated to resemble pre-PCC streetcars in order to attract tourists or for other appearance purposes. A similar phenomenon is Duck Tours, which uses amphibious DUKWs converted into buses/cruise boats for tour purposes.

School bus service provides transit to and from school for students. Some private schools use school buses only for field trips or sports events. Some school systems, such as the San Francisco public school system, do not operate their own school bus system but instead rely on the local public transit bus system to provide transportation for the system.

Charter bus operators, provide buses with properly licensed bus drivers for hire.