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Wetlands are the largest global source of atmospheric methane (CH₄), a potent greenhouse gas. However, methane emission inventories from the Amazon floodplain^,, the largest natural geographic source of CH₄ in the tropics, consistently underestimate the atmospheric burden of CH₄ determined via remote sensing and inversion modelling^,, pointing to a major gap in our understanding of the contribution of these ecosystems to CH₄ emissions. Here we report CH₄ fluxes from the stems of 2,357 individual Amazonian floodplain trees from 13 locations across the central Amazon basin. We find that escape of soil gas through wetland trees is the dominant source of regional CH₄ emissions. Methane fluxes from Amazon tree stems were up to 200 times larger than emissions reported for temperate wet forests and tropical peat swamp forests, representing the largest non-ebullitive wetland fluxes observed. Emissions …