large group of people participating in what appears to be a fishing event in a wide, muddy-looking river

large group of people participating in what appears to be a fishing event in a wide, muddy-looking river. The water is calm. The sky is clear and blue. People are spread out across the water, many of them using large, open-framed nets supported by buoyant objects like gourds or yellow containers. The people are mostly submerged up to their chests or necks. Some people are waving or have their arms raised. The shoreline in the background is visible with some vegetation and what looks like buildings in the distance.