Tucked into the northeastern corner of Tierra del Fuego, Argentina, the Río Ewan (Brazo Norte) — the north branch of the Ewan River system — is one of the island's notable sea trout rivers, flowing through a remote and wild landscape that defines Patagonian fishing at its most elemental. The Ewan River system has long been recognized as scientifically and ecologically significant, having been the site of the first serious anadromous salmonid study conducted in Tierra del Fuego, carried out in 2001 by local fisheries biologist Miguel Casalinuovo. That foundational research established baseline biological and ecological data for brown trout in the region, and the Ewan has since been referenced alongside the Río Menéndez and Río Grande as one of the island's three major rivers. Like its neighboring waters on the northeastern coast, the Brazo Norte hosts sea-run fish moving in from the Beagle Channel and surrounding marine waters, making it a legitimate destination for anglers chasing the wild sea trout that have made Tierra del Fuego world-famous.