Texas is oil country. It leads the nation in oil production, and would be one of the top oil-producing nations if it were its own country. This map illustrates those points by breaking down Texas' oil production by county.
The data for the map comes from the Texas Railroad Commission's data query feature. This particular data set shows how many barrels of oil each county produced between June 2012 and June 2013.
Not surprisingly, the most intense production came from the Eagle Ford Shale and Permian Basin regions. The most prolific county over the past year was Karnes County, which is about 60 miles southeast of San Antonio. Oil operations in Karnes County shipped out over 46 million barrels of oil last year. The only regions which did not produce much oil were the Hill Country and the extreme northeast part of the state.