The present day Republic of Tunisia, al-Jumhuriyyah at-Tunisiyyah, is situated in Northern Africa. Geographically situated between Libya to the east, Algeria to the west and the Mediterranean Sea to the north. Tunis is the capital and the largest city (population over 800,000); it is near the ancient site of the city of Carthage. Throughout its recorded history, the physical features and environment of the land of Tunisia have remained fairly constant, although during ancient times more abundant forests grew in the north, and earlier in prehistory the Sahara to the south was not an arid desert. The weather is temperate in the north, which enjoys a Mediterranean climate with mild rainy winters and hot dry summers, the terrain being wooded and fertile. The Medjerda river valley (Wadi Majardah, northeast of Tunis) is currently valuable farmland. Along the eastern coast the central plains enjoy a moderate climate with less rainfall but significant precipitation in the form of heavy dews; these coastlands are currently used for orchards and grazing. Near the mountainous Algerian border rises Jebel ech Chambi, the highest point in the country at 1544 meters. In the near south, a belt of salt lakes running east–west cuts across the country. Further south lies the Sahara desert, including the sand dunes of the Grand Erg Oriental. History of early Tunisia Stone age tools dating from the Middle Stone Age (around 200,000 years ago) found near Kelibia are the earliest evidence of human activity in the region. Finds have been made of stone blades, tools, and small figurines of the Capsian culture (named after Gafsa in Tunisia), which lasted from around 10,000 to 6,000 BC (the Mesolithic period). Seasonal migration routes evidence their ancient journeys. Saharan rock art, consisting of inscriptions and paintings that show design patterns as well as figures of animals and of humans, are attributed to the Berbers and also to black Africans from the south. Dating these outdoor art works has proven difficult and unsatisfactory.