Ngorongoro conservation
Ngorongoro conservation area a protected area and UNESCO World heritage site located in NgoroNgoro district 180 km west of Arusha city in Arusha region , the name of the crater has onomatopoeic origin : it was named by the Maasai pastoralist after the sound produced by the cowbell (NgoroNgoro) Based on fossil evidence found at the Olduvai Gorge, various hominid species have occupied the area 3 million years