According to the U.S. Census Bureau, the county has a total area of 685 square miles (1,770 km2), of which 681 square miles (1,760 km2) is land and 3.8 square miles (9.8 km2) (0.6%) is water. It is the fourth-largest county in Tennessee by area. The county is located atop the Cumberland Plateau.
Revenue passenger kilometres (RPK) is a measure of the volume of passengers carried by an airline. A revenue passenger-kilometre is flown when a revenue passenger is carried one kilometre. A passenger for whose transportation an air carrier receives commercial remuneration is called a revenue passenger.
Received Pronunciation (or RP) is a special accent-a regionally neutral accent that is used as a standard for broadcasting and some other kinds of public speaking. It is not fixed-you can hear earlier forms of RP in historical broadcasts, such as newsreel films from the Second World War.P is also a very loose and flexible standard. It is not written in a book (though the BBC does give its broadcasters guides to pronunciation) and does not prescribe such things as whether to stress the first or second syllable in research.