The Gallegos runs through the same steppe country as its more famous neighbour, carrying sea-run browns up from the Atlantic into alluvial water that fishes with real consistency across the season. It lacks Río Grande's outsized reputation but not its substance — strong fish, taken on the same family of flies, Sunray Shadows and Stoat's Tails swung through defined runs at first and last light when sea-run fish are most willing to move. The river also holds resident browns that respond to more conventional presentation outside the migratory windows. Guides who know the current beat divisions and run timing are worth engaging rather than working it blind, since access and productive water shift through the season. Treat it as serious sea-trout water in its own right rather than a quieter alternative — the fishing here has earned its place among Patagonia's trophy rivers.

• Alluvial