Yondó is a town and municipality in Antioquia Department, Colombia. The first settlers arrived around 10,000 BC; archaeological site. The town was founded in 1941 for lodge the, at that time, discovered Casabe oilfield's workers. The town became a municipality in 1979. It is a Magdalena river port, across a river from Barrancabermeja, where Colombia's oldest and largest oil refinery is located.