Bahía de Arauco is a coastal bay on the Pacific Ocean in Chile's Biobío Region, defined by the Arauco Peninsula to the west. The Bio Bio River discharges into the northern end of the bay, approximately 10 kilometers west of Concepción. This is a sizable, open saltwater bay with a direct connection to the Pacific, meaning paddlers must anticipate significant oceanic conditions including swell, wind exposure, and potentially strong currents. The shoreline is populated, with several towns providing potential access points including Arauco, Lota, and Coronel. These towns, particularly Lota, have a deep historical connection to the 19th and 20th-century coal mining industry, which was central to the regional economy. The bay itself was a key export route for this coal, shipped to international markets. The surrounding landscape has been heavily shaped by industrial forestry, with large plantations of non-native pine trees replacing native coastal forests. The bay's history is also marked by the centuries-long Arauco War between the Mapuche people and Spanish colonizers, with the region considered part of the Mapuche heartland. For paddlers, this translates to a dynamic marine environment where careful planning for wind, waves, and tidal currents is essential. The proximity to industrial ports and historical mining towns offers a unique, culturally rich backdrop characterized by a mix of natural coastal features and a legacy of human industry.