The Congo Basin is a globally important climatic region with annual rainfall of between 1500 and 2000 mm. It is one of three hotspots of deep convection (thunderstorms) in the tropics, the other two being over the Maritime continent and the Amazon. These three regions together drive the climate circulation of the tropics and beyond. The Congo Basin has the highest lightning strike frequency of anywhere on the planet.^[8] The high rainfall supports the second largest rainforest on Earth, which is a globally significant carbon sink^[9] and an important component of the global carbon cycle.

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