What is the African valley that is almost 4000 miles long?

The African valley that is almost 4,000 miles long is the East African Rift Valley. This geological feature stretches from the Afar Triangle in northeastern Africa down to Mozambique. It is significant for its unique geological formations and biodiversity, as well as its role in the tectonic activity of the region. The rift is home to several lakes, including Lake Victoria and Lake Tanganyika.