This wiped out the negative legacy of decades of military-backed authoritarian rule.The country's last dynasty, the Yi Dynasty of the Choson Kingdom, lasted 500 years.Korea In Focus aims to give you a brief overview to help in your general awareness of Korea today.More detailed information can be obtained from individual organizations or government offices.The landscape is spectacular in its variations and about 70 percent of it is mountaneous.The oceans around the Peninsula are a major source of livelihood and recreation for Koreans.The shoreline is dotted by more than 3,000 islands.The Peninsula's longest river is the Amnokkang (790 km) in the North.Korea's kindoms and dynasties generally lasted about 500 years or more.The population of the Republic of Korea was estimated at 44.1 million in 1993.