aerial of river with small islands infested with blue green algae

green, blue, summer, outdoors, nature, environment, growth, plant, texture, water, flora, natural, danger, tree, dangerous, river, landscape, exterior, ecology, toxic, organic, environmental, dirty, surface, biology, waste, problem, ecological, Pollution, aquatic, lake, ecosystem, disaster, island, aerial, contamination, slimy, slime, swamp, algae, polluted, sewage, drone, plankton, contaminated, infest, cyanobacterium, cyanobacteria, no people, natural lighting,