By Rebecca Morelle
Science correspondent, BBC News
Footage shows the team trekking to find the bog, as Dr Simon Lewis explains
A vast peatland has been discovered in a remote part of Congo-Brazzaville.
The bog covers an area the size of England and is thought to contain billions of tonnes of peat.
Scientists say investigating the carbon-rich material could shed light on 10,000 years of environmental change in this little-studied region.
Dr Simon Lewis, from the University of Leeds, said: "It's remarkable that there are parts of the planet that are still uncharted territory."
He added: "Few people venture into these swamps as they are quite difficult places to move around in and work in."
Satellite images initially hinted at the presence of the enormous tropical peatland, but an expedition, starting from Itanga village in April, confirmed it was there.
The discovery team, from the University of Leeds, the Wildlife Conservation Society-Congo and Congo-Brazzaville's Marien Ngouabi University, had to contend with dwarf crocodiles, gorillas and elephants as they explored the area. But they said the biggest challenge was soggy feet.
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