The Kittatinnies are a far northeastern extension of the Ridge and Valley province of the Appalachian Mountains. In Pennsylvania, the ridge forming the Kittatinnies becomes known as Blue Mountain and runs southwest for , nearly to Maryland. In Franklin County, Pennsylvania, however, a parallel ridge to Blue Mountain is named "Kittatinny Mountain"; the Pennsylvania Turnpike tunnels through both ridges (a very short distance apart) with the western tunnel named "Kittatinny Mountain" and the eastern one "Blue Mountain." To the north in New York, the ridge is known as the Shawangunk Mountains which goes to Kingston, New York.