Arroyo Mártires is a stream in the province of Misiones, Argentina, flowing near the small town of Mártires. The stream is part of an ecological reserve characterized by diverse flora and fauna typical of the Misionera jungle, and its waters are notably green in color.

The main access point for paddlers is on Ruta Provincial 103, at the bridge over Arroyo Mártires Grande, where the local operator Yasý, Selva & Agua runs guided kayak excursions daily. The standard route covers 4 km on the water and is rated low difficulty, making it accessible to paddlers without advanced technical skills. Tours require a minimum of two people and can be reserved in advance. The paddling portion is combined with a 2 km trekking segment through the surrounding jungle, offering direct exposure to the area's biodiversity.

The CostaVerde property, situated 4,600 meters from Ruta Provincial No. 4 at km 78 and approximately 300 meters from Ruta Provincial 103, provides camping and recreational facilities on 27 hectares. The site includes access to the stream for swimming, as well as waterfalls in the vicinity. CostaVerde is located roughly 28 km from Oberá and 68 km from Posadas, making it a practical base for visitors arriving from either city.

The surrounding environment is dense jungle with a wide variety of plant and animal species, and the area is promoted as an ecotourism destination. The combination of accessible flatwater paddling and intact jungle habitat makes Arroyo Mártires a practical destination for paddlers interested in wildlife and natural surroundings rather than technical whitewater.