Arroyo Guerrero is a tributary stream located in the Misiones province of Argentina, flowing through one of the most biodiverse regions of the country. Situated at approximately 27°45'57"S, 55°09'33"W, this arroyo is part of the broader Uruguay River drainage system, winding through the lush subtropical landscape that characterizes the Mesopotamian region of northeastern Argentina. The stream is also locally known as Arroyo López, and its waters support a rich assemblage of native fish species typical of the Misiones ichthyofauna. The surrounding riparian environment reflects the dense Atlantic Forest ecosystem of Misiones, making it not only a productive fishing destination but also a visually stunning one.