Every masterpiece needs a brushstroke to tie it together. For Yosemite National Park, in the United States, that stroke is the Merced River—painting reflections of granite cliffs, pine forests and waterfalls across its canvas. One of the National Wild and Scenic Rivers, this waterway begins high in the Sierra Nevada. It gathers meltwater and winds 233 kilometres west through Yosemite Valley into California's Central Valley.

Its Spanish name, 'El Río de Nuestra Señora de la Merced,' translates to 'River of Our Lady of Mercy,' and suits it well: it offers both calm and chaos depending on the season. Spring turns the river into Yosemite's main act, as snowmelt sends torrents rushing beneath stone bridges and past roaring waterfalls like Vernal and Nevada Falls. Summer brings a gentler flow that attracts rafters and swimmers. Fall adds a hint of gold as leaves drift downstream, and winter slows everything to a reflective stillness. Interestingly, it feeds Lake McClure, where a ghost town rises when water levels drop in autumn and winter. Along its lower stretches once stood Merced Falls, a bustling mill town during the Gold Rush era, now lying quiet.