Tanzania is bordered on the south by Mozambique, Malawi, and Zambia; on the west by Zaire, Burundi, and Rwanda; on the north by Uganda and Kenya; and on the east by the Indian Ocean. Tanzania is the largest of the East African nations, and it possesses a geography as mythic as it is spectacular.

In the northeast of Tanzania is a mountainous region that includes Mt. Meru (14,979 ft/4,566 m) and Mount Kilimanjaro (19,340 ft./5,895 m), the latter of which is the highest point in Africa and possibly the most breathtaking mountain imaginable. To the west of these peaks is Serengeti National Park, which has the greatest concentration of migratory game animals in the world (200,000 zebra, for example). Within the Serengeti is Olduvai Gorge, the site of the famous discoveries by the Leakeys of fossil fragments of the very earliest ancestors of Homo sapiens. The Serengeti also contains the marvelous Eden of Ngorongoro, a 20-mile-wide volcanic crater that is home to an extraordinary concentration and diversity of wildlife.

Moving west from the Serengeti, one reaches the shores of Lake Victoria, the largest lake on the continent and one of the primary headwater reservoirs of the Nile. Southwest of Lake Victoria, and forming Tanzania's border with Zaire, is Lake Tanganyika, the longest and (after Lake Baikal) deepest freshwater lake in the world. It was at Ujiji, a village on the Tanzanian shore of Lake Tanganyika, that H.M. Stanley presumably encountered David Livingstone in 1871. Livingstone had fallen ill while searching for the source of the Nile, and despite his illness he refused to leave. Instead, he persuaded Stanley to accompany him on a journey to the north end of Lake Tanganyika. The region that they passed through has since become famous as Gombe National Park, the site of Jane Goodall's chimpanzee research station.

The climate of Tanzania varies quite a bit, considering that its environment includes both the highest and the lowest points on the continent. While the narrow lowland coastal region is consistently hot and humid, the central regions of Tanzania are sufficiently elevated so as to offer much cooler temperatures. The rainy seasons extend from November to early January and from March to May.

The history of human habitation in Tanzania goes back almost two million years, and the fossils found at Olduvai Gorge by Louis and Mary Leakey now stand among the most important artifacts of the origins of our species. Artifacts of later Paleolithic cultures have also been found in Tanzania. There is evidence that communities along the Tanzanian coast were engaging in overseas trade by the beginning of the first millennium AD. By 900 AD those communities had attracted immigrants from India as well as from southwest Asia, and direct trade extended as far as China. When the Portuguese arrived at the end of the 15th century, they found a major trade center at Kilwa Kisiwani, which they promptly subjugated and then sacked. The Portuguese were expelled from the region in 1698, after Kilwa enlisted the help of Omani Arabs. The Omani dynasty of the Bu Said replaced the region's Yarubi leaders in 1741, and they proceeded to further develop trade. It was during this time that Zanzibar gained its legendary status as a center for the ivory and slave trade, becoming in 1841 the capital city of the sultan of Oman.

In Tanzania's interior, at about the same time, the cattle-grazing Maasai migrated south from Kenya into central Tanzania. Soon afterward, European exploration of the African continent began, followed by colonialist usurpation of political and economic power. Tanzania fell under German control in 1886, but this control was handed to Britain after World War 1. Present day Tanzania is the result of a merger between the mainland (previously named Tanganyika) and Zanzibar in 1964, after both had gained independence. Tanzania has experienced much economic hardship since independence, and its people are still very poor. However, it is a peaceful and democratic country that has enjoyed average economic growth of over 5% per annum in recent years.  The maintainence of political stability and continued economic reform will be crucial to support Tanzania's economic development, as will continued aid and good will to support community and economic development. The effects of global warming and the global economic slowdown since 2007 are likely to have an effect on a country that relies heavily on the exportation of agricultural products for income.