Seasonal variations with alternating dry and rainy seasons and fluctuating levels of nutrients are factors that significantly influence greenhouse gas emissions from soda lakes in the Pantanal, considered less common than emissions from freshwater lakes. The Pantanal is the world's largest tropical wetland, with an area of 153,000 km2, mostly (77.41%) in southwestern Brazil, but also partly in Bolivia (16.41%) and Paraguay (6.15%).