The park covers about 1,800 square kilometres — that is roughly the size of London and all its suburbs put together. Deep inside, the trees grow so tall and close together that their leaves make a roof called a canopy, and the forest floor stays cool and shadowy even on the hottest day.
Sapo is home to some of Africa's rarest creatures. Pygmy hippos splash in its rivers, chimpanzees swing through the trees, and African forest elephants quietly wander between the giant roots. Hundreds of bird species live here too, including brilliantly coloured kingfishers and the peculiar-looking hornbill with its massive beak.
The Sinoe River winds all the way through the park, and local Sapo people have lived close to this forest for generations. They know the names of every tree and how to read the sounds of the jungle. Their knowledge helps scientists who come to study the wildlife.
Rangers patrol Sapo every day to keep it safe and healthy. Because the park is so large and remote, many parts have never been fully explored by scientists, which means there could still be plant and animal species waiting to be discovered.