Arroyo Tunas is a stream located in the Garupá area of Misiones Province, Argentina, a region renowned for its rich subtropical biodiversity and productive freshwater fishing. Misiones sits in the far northeastern corner of Argentina, bordered by Brazil and Paraguay, and is characterized by dense Atlantic Forest, red laterite soils, and a network of arroyos (streams) that drain into larger river systems. The landscape is lush and humid year-round, fed by significant rainfall that sustains the region's waterways and the diverse fish communities that inhabit them.