|Georgia is the ninth largest state of the United States by the size of population, while it is 24th largest in total area. According to a 2008 estimate, the population of the state was 9,685,744. It has a total area of 59,425 square miles with a length of 298 miles and a width of 230 miles. In the list of most densely populated states of the US, it ranks eighteenth with an average of 141 persons living in a square mile of area. The neighborhood of Georgia consists of Florida, Alabama, Tennessee, North Carolina and South Carolina. Its coastline faces the Atlantic Ocean to the east. Georgia was among the original thirty colonies that took part in the American Revolution and when the United States Constitution was promulgated, the state was the fourth to ratify it. It ceded from the Union in 1861 to join confederacy along with seven other states. However, it was readmitted into the Union in 1870. The northern part is a mountainous region consisting mainly of Blue Ridge Mountains, a range of Appalachians. The foothills extend further down to the south to vanish into continental coastal plain. Brasstown Bald is the highest point with a height of 4,784 feet, while the sea level is the lowest point. Atlanta, the most populous area, is the capital and the largest city in the state of Georgia.