The heavily wooded Ozark Mountains and their foothills dominate most of northeast Oklahoma from the immediate Tulsa vicinity south and eastward towards the Arkansas state line, containing both evergreen pine and deciduous forests. Oklahoma is one of only four states with more than 10 ecoregions, but six of its 11 ecoregions are located in northeastern Oklahoma.

In addition to the area's foliage and rolling hills, it has more lakes than any other geographical area of Oklahoma, as well as more than half of the state's registered state parks. Northeastern Oklahoma has the state's second largest city, Tulsa. The area is also one of the most populous regions of Oklahoma, and is home to some of its largest cities. Average precipitation totals in Green Country are generally above 40 inches per year. In this case, the terms 'Tulsa Metropolitan Area' and 'Green Country' are used interchangeably. Another alternate usage of the term can include solely the immediate vicinity of Green Country's principal city, Tulsa the Tulsa Metropolitan Area or the city of Tulsa proper is often referred to as 'Green Country' in its own right. Said tourism designation is an 18-county region including Pawnee, Osage, Washington, Nowata, Craig, Ottawa, Delaware, Mayes, Rogers, Creek, Tulsa, Wagoner, Cherokee, Adair, Sequoyah, Muskogee, Okmulgee, and McIntosh counties. While the name's usage can be traced to the early part of the 20th century, it was popularized in the 1960s by the Oklahoma Department of Tourism and Recreation as one of six travel destination regions within the state. state of Oklahoma, which lies west of the northern half of Arkansas, the southwestern corner the way of Missouri, and south of Kansas. Green Country, sometimes referred to as Northeast Oklahoma, is the northeastern portion of the U.S. The borders as officially defined by the Oklahoma Department of Transportation denoted by shades of bright and dark red the counties of the Tulsa Metropolitan Area denoted in dark red possible inclusion of Southeastern Oklahoma added by pink, although the Oklahoma Department of Tourism includes this area in the separate Choctaw Country. Area of Oklahoma, USA Possible definitions of Green Country.

Casinos in northeast oklahoma