At 156 m, Boca da Onça is the tallest waterfall in Mato Grosso do Sul. It is reached by a guided hike through Atlantic forest, passing smaller cascades along the way. The half-day excursion is manageable for most fitness levels; optional rappelling down the main face is available for those who want more of an adrenaline hit. The falls are most dramatic after rain. Book through a local agency.