Selous is the largest game reserve in Africa. Established in 1922, it covers 5% of Tanzania's total area. The southern area is a forbidden zone that is undeveloped, heavily forested, and contains a series of steep cliffs. Travelers are limited to the area north of the Rufiji River. This area of the Selous Game Reserve has large open grassland, woodlands, rivers, hills and plains. The best time to visit is July through October..