The Medellín River is a Colombian river that flows through the city of Medellín and its metropolitan area from south to north, becoming an integrating axis of the city. The Medellín River converges beyond the limits of the municipality of Barbosa with the Grande River and forms the Porce River. The Porce River flows into the Dos Bocas site in the municipality of Anorí on the Nechí River, which then flows into the Cauca River and finally into the Magdalena River, which ultimately flows into the Caribbean Sea. Thus, it constitutes part of a complex drainage network.