Located 63 km north of Mto wa Mbu on the way to Oldonyo Lengai and Lake Natron is one of Tanzania’s most important historic sites, Engaruka. Some 500 years ago, a farming community of several thousand people developed an ingenious irrigation and cultivation system. For unknown reasons, the farmers left Engaruka around 1700. Many questions remain unanswered: who were the people living in Engaruka, how did they come to develop such an ingenious farming system and why did they finally leave Engaruka? This tour may provide some answers to these questions.