The Sierpe River originates from deep within the vibrant jungles at the northeastern edge of the Osa Peninsula. The river snakes its way 48 km (30 miles) out to the Pacific Ocean in a maze of winding, interconnected stream channels that lend it the name “Sierpe,” which means “serpent” in Spanish. By the time it reaches the ocean, the Sierpe River spreads out to more than a kilometer wide. Both the Sierpe and Terraba rivers meander their way to the sea through the Terraba Sierpe National Wetlands (Spanish: Humedal Nacional Térraba-Sierpe), the largest contiguous mangrove forest in Costa Rica and one of the largest of Central America. Six species of unique salt-tolerant trees form the peaceful mangrove forests that are home to a diversity of birds, mammals, insects, amphibians, reptiles, and fishes.
A wild and winding river
Even though both are very remote, the mouth of the Sierpe River is quite different from its forested headwaters. Downstream from the town of Sierpe, the river widens meanders through sandbars and expansive mangrove forest. Closer to the ocean, the river sometimes flows in the opposite direction on an incoming tide. As the tides recede, incoming swells can create choppy conditions at the mouth of the river, but local captains are experts at crossing “la boca.” The Sierpe River is the gateway to adventure in the Osa Peninsula. Whether you are in search of surfing, kayaking, culture, hiking, fishing, or wildlife viewing, you are sure to find it here.