Arusha Region is a global tourist destination and is the center of the northern Tanzania safari circuit. The national parks and reserves in this region include Ngorongoro Conservation Area, Arusha National Park, the Loliondo Game Controlled Area, and part of Lake Manyara National Park. Remains of 600-year old stone structures are found at Engaruka, just off the dirt road between Mto wa Mbu and Lake Natron.
Paul's theory of preaching in a province was not to preach in every place in it himself, but to establish centres of Christian life in two or three important places from which the knowledge might spread into the country round. This is important, not as showing that he preferred to preach in a capital rather than in a provincial town or in a village, but because he intended his congregation to become at once a centre of light.