Africa is slowly tearing itself into two continents

The East African Rift is a roughly 4,000-mile crack where the African tectonic plate is splitting into the Somali and Nubian plates, pulling apart by a few millimetres a year. Over millions of years the rift will widen into a new ocean basin, eventually separating the Horn of Africa from the rest of the continent. It's already visible today as a chain of valleys, volcanoes and lakes running from the Red Sea down to Mozambique.

— Standard geological accounts, East African Rift — Ongoing tectonic process