Tackle 15 km of Class III–IV rapids on the Upper Balsa River, a fast, technical run carved through volcanic terrain near Arenal. Expect powerful currents, guided raft maneuvers, river swims, fresh fruit stops, and a local casado lunch back in La Fortuna.
More ways to explore the area's outdoor wonders
The raft heels and the river answers: green water gouged through lava and volcanic ash, a few boulders sticking their teeth out, and a guide’s voice cutting the rush with a clear command. You launch from a gravel bar under tropical canopy and spend the next 15 kilometers negotiating the Upper Balsa’s carved channels—rapids that push, tease and demand attention.
Difficulty
challenging
Duration
5 hours
Fitness Level
Good cardiovascular fitness and core strength; able to paddle actively and recover from short swims.
Wildlife
History
The Balsa’s channel has been shaped by volcanic deposits from the Arenal massif and by decades of seasonal rains, creating concentrated rapids on a short course.
Conservation
Choose guides who practice leave-no-trace shore stops and avoid sunscreens with harmful chemicals; operators often work with local communities to minimize riverbank impact.
Reserve your spot on the Upper Balsa River White Water Rafting Class 3/4 in Costa Rica today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Be confident in the water
You should be comfortable swimming in river currents and following guide rescue instructions; operators assist but training helps.
Wear secure footwear
Closed-toe water shoes with a heel strap prevent lost footwear on rocky eddies and during swims.
Protect from sun and rain
Apply reef-safe sunscreen before launch and bring a light waterproof layer—conditions can flip quickly in the tropics.
Hydrate and fuel up
Eat a solid breakfast and bring snacks if you have special dietary needs; guides provide bottled water and a post-run lunch.
Closed-toe water shoes
Grip and protection on rocky launches, and they stay on during swims.
Quick-dry synthetic clothing
Dries fast and won’t weigh you down if you get wet.
Reef-safe sunscreen
Protects from tropical sun without harming aquatic life.
summer
Small dry bag or waterproof phone case
Keeps essentials dry and lets you carry a camera or extra snacks.