East Tennessee is a name given to approximately the eastern third of the state of Tennessee. Unlike the names given to regions or portions of many of U.S. states, the term East Tennessee can be precisely defined. It is the portion of the state located within the Eastern Time Zone and four counties in the Central Time Zone, namely Bledsoe, Cumberland, Marion, and Sequatchie Counties. East Tennessee is noted for its mountains, particularly the Great Smoky Mountains portion of the Blue Ridge Mountains, but in fact has many and varied landforms. It is also known for being the birthplace of Country music.