Arroyo Hernandarias is a stream located in the Entre Ríos Province of Argentina, within the Mesopotamian region. It flows near the town of Piedras Blancas. The water body is recognized as a destination for paddlesports, including kayaking and stand-up paddleboarding, as well as for fishing. Specific access points for putting in and taking out are available for planning purposes. The stream's conditions and the boundaries between private and public land along its course are important considerations for trip planning. The overall character of the paddling experience is shaped by its location in the Argentine Mesopotamia, suggesting a relatively flat, riverine landscape.