Panama, officially the Republic of Panama (Spanish: República de Panamá), is the southernmost country of Central America. Situated on an isthmus, some categorize it as a transcontinental nation connecting the north and south part of America. It is bordered by Costa Rica to the north-west, Colombia to the south-east, the Caribbean Sea to the north and the Pacific Ocean to the south. It is an international business center and is also a transit country. Although Panama is also the 3rd largest economy in Central America, after Guatemala and Costa Rica, it has the largest expenditure on resource consumption, making the country the largest consumer in Central America. Pre-Columbian heritage of native populations whose presence stretched back over 11,000 years. The earliest traces of these indigenous peoples include fluted projectile points. This changed into significant populations that are best known through the spectacular burials of the Conte site (dating to c. AD 500-900) and the polychrome pottery of the Coclé style. The monumental monolithic sculptures at the Barriles (Chiriqui) site were another important clue of the ancient isthmian cultures. Prior to the arrival of Europeans, Panama was widely settled by Chibchan, Chocoan, and Cueva peoples, among whom the largest group were the Cueva. There is no accurate knowledge of size of the indigenous population of the isthmus at the time of the European conquest. Estimates range as high as two million people, but more recent studies place that number closer to 200,000. Panama is located in Central America, bordering both the Caribbean Sea and the Pacific Ocean, between Colombia and Costa Rica. Its location on the Isthmus of Panama is strategic. By 1999, Panama controlled the Panama Canal that links the North Atlantic Ocean via the Caribbean Sea with the North Pacific Ocean. The dominant feature of the country's landform is the central spine of mountains and hills that forms the continental divide. The divide does not form part of the great mountain chains of North America, and only near the Colombian border are there highlands related to the Andean system of South America. The spine that forms the divide is the highly eroded arch of an uplift from the sea bottom, in which peaks were formed by volcanic intrusions.