What long valley extends along the eastern side of Africa on the valley floor are several long slender lakes?

The long valley that extends along the eastern side of Africa is the East African Rift Valley. This geological feature is characterized by several long, slender lakes, including Lake Tanganyika and Lake Malawi, which are among the deepest and oldest lakes in the world. The rift is a tectonic plate boundary, leading to significant geological activity and diverse ecosystems in the region.