Maroni River (IMAGE) Dartmouth College Caption The Maroni River flows through tropical rainforest along the border of Suriname and Guyana. Its basin was relatively unaltered until the 1990s. In the past 25 years, major deforestation, mostly by mining operations, has increased erosion in the basin. The formerly dark brown or blackwater river now carries additional sediment year-round, even during the dry season. These images from 1993 (left) and 2021 (right) show some of the land use transformation by mining operations and resulting flow of muddy water into the river. Images: NASA Landsat/United States Geologic Survey. Figure compiled by Evan Dethier. Credit Images: NASA Landsat/U.S. Geological Survey. Figure compiled by Evan Dethier. Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.