The Congo rainforest in central Africa has one of the longest rivers in the world, the Congo River. The tropical rainforest covers most of the eastern part of the Congo. 

This forest and its river were the subject of a famous book called The Heart of Darkness by Joseph Conrad. Hunting and poaching has endangered many of the animals there, but the jungle itself is not being destroyed.

Plants 
The basin of the Congo has 70% of Africa's plant cover. It makes up a large portion of Africa's biodiversity with over 600 tree species and 10,000 animal species.

Animals  
Many unusual animals live in the Congo Basin. The two species of chimpanzee, for example, live only in the Congo rainforests. The large one is the common chimpanzee (Pan troglodytes), and the smaller one is the bonobo (Pan paniscus). They live in different areas. Also, gorillas live in the rainforest of central Africa. The gorillas of the Congo rainforest are called "lowland gorillas". 

The hippopotamus is another animal that can be found in the Congo rainforest, usually in the river. Elephants also live in the rainforest, but only the smaller African forest elephant (Loxodonta cyclotis). Another interesting animal in the Congo rainforest is the okapi. The okapi is an interesting species. It is related to the giraffe, but looks more like a zebra. There are other endemic or notable mammals, such as Allen's swamp monkey, the dryas monkey, the aquatic genet, and there is also the Congo peafowl.

There are a variety of snakes, but snakes of the Congo basin are not so well known as those of the rest of Africa.

Geography
The Congolese forests cover southeastern Cameroon, eastern Gabon, the northern and central Republic of the Congo, the northern and central Democratic Republic of the Congo and portions of southern and southwestern Central African Republic.

Ecology
To the north and south, the forests transition to drier forest-savanna mosaic, a mosaic of drier forests, savannas, and grasslands. To the west, the Congolese forests transition to the coastal Lower Guinean forests, which extend from western Gabon and Cameroon into southern Nigeria and Benin; these forests zones share many similarities, and are sometimes known as the Lower Guinean-Congolese forests. To the east, the lowland Congolese forests transition to the highland Albertine Rift montane forests, which cover the Mountains lining the Albertine Rift, a branch of the East African Rift system. The Congolese Forests are a global 200 ecoregion.

The Congo Rainforest is the world’s second largest tropical forest, spans six countries, and contains a quarter of the world’s remaining tropical forest. With annual forest loss of 0.3% during the 2000s, the region has the lowest deforestation rate of any major tropical forest zone.

History  
There were lots of important kingdoms in the Congo region before the Europeans came there. The Kongo Empire was one of these. The Kongo was a group of small states near the mouth of the Congo river ruled by a king. That nation gave the river its name.
The Portuguese came to the Kongo for the first time in the 1480s. Portugal was sailing farther and farther along the coast of Africa to reach India and China on the other side. At first they made friends with the Kongo nation. They sent missionaries and ambassadors. Unfortunately, the friendship did not last. The Portuguese were more interested in making money than making friends. The Portuguese treated the people of the Kongo badly. The king of Kongo became a Christian and took the name Afonso. He wanted to learn from the Europeans and teach his people, but the Portuguese only wanted to use their friendship with Afonso to gain slaves to sell. Many people were sold as slaves, and within 100 years the kingdom of Kongo was destroyed.

The Portuguese could not sail up the river because of the waterfalls about 120km from the mouth. Also, the hot and wet tropical region was uncomfortable for Europeans. So, the Congo area was not explored or claimed again by any European country for many years.

In the 1850s a reporter named Henry Stanley went to find one of the most famous missionary/explorers in history, Dr. David Livingstone, who had disappeared into the jungle. Stanley became the first man known to have followed the Congo river across Africa to its source. He proved that there were many miles of navigable river above the waterfalls. His discoveries interested King Leopold of Belgium. The king hired him to build a road around the waterfalls and trading posts along the river itself. In this way, the king gained control of the river basin. In 1885, Leopold used his control of the river to claim all of the Congo as his own private land.

The region was named the Congo Free State, but it was not free. King Leopold only cared about making money from the land. The people were treated cruelly. They were forced into slavery to build roads and gather rubber latex. When they did not do what their Belgian masters wanted, they were often killed. Missionaries in the Congo began to write letters and articles about the things that were happening.

Eventually the anger over what was happening forced the government of Belgium to take the land away from the king. It was renamed the Belgian Congo, but Belgium did not do very much to help the people. Catholic missionaries did set up schools, with the help from the government. But Europeans ran all the schools, businesses, army, large farms, and government.

Before World War II (1939-1945), almost all the countries of Africa were European colonies. After the war, these nations began to demand and receive their independence. Belgium did not want to give the Congo its independence, but after a fight in 1957, they made an agreement. The Congo became a free nation in June 1960.

References 

Rainforests
Geography of the Democratic Republic of the Congo