The body of water known for its biodiversity rich in fish species is the Amazon River, which flows through South America. This river supports many aquatic ecosystems, providing habitat for thousands of species, including various fish species like piranhas and arapaima. The Amazon Basin's wetlands contribute to its vast biodiversity, making it one of the most significant ecosystems on the planet. The unique interactions between species and their environment are essential for ecological balance. Additionally, the river plays a crucial role in the livelihoods of local communities, relying on its resources for sustenance and economic activities.