Ghana was formed at an unknown time and was initially led by outsider Dinga Cisse. Gold mining was important to the economy, and miners guarded the secret locations of gold fiercely. The region has very diverse geography, ranging from desert landscapes to tropical rain forests. The climate is hot and humid, influenced by proximity to the equator. Osei Tutu became a notable ancient leader as he succeeded in taking the throne in 1697 for the Ashanti people, who traded with Phoenicians long before the Christian era.