I can tell you about the Horn of Africa. The Harla, is an early Hamitic group of tall stature who inhabited parts of Somalia, Tchertcher, and other areas in the Horn, also erected various tumuli. 
 Can you tell me about the history? 
 I believe that the oldest evidence of the burial customs in the Horn of Africa come from their cemeteries, which date back to the 4th millennium BC. 
 I'm afraid I have no further information on their culture. But I do know that Somalia has been inhabited since the Paleolithic times. 
 Can you tell me more about the culture?
I can tell you about the Horn of Africa. The Harla, is an early Hamitic group of tall stature who inhabited parts of Somalia, Tchertcher, and other areas in the Horn, also erected various tumuli.