El Castillo

Río San Juan Department, Nicaragua

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El Castillo, located along the San Juan River in Nicaragua’s Río San Juan Department, is a small riverside town best known for the historic Fortress of the Immaculate Conception.

Built by the Spanish between 1673 and 1675, the fortress was designed to protect the route to Granada from pirate attacks and remains one of the country’s most important colonial landmarks. The town grew around the fortress and retains a peaceful, traditional atmosphere, with river transport serving as the main way to get around. Its scenic setting, colorful riverside buildings, and rich history make it a distinctive destination in Nicaragua.

El Castillo is also a gateway to the nearby Indio Maíz Biological Reserve, one of the largest and most biodiverse rainforests in Central America. Visitors come to explore the fortress, enjoy boat trips along the river, observe wildlife, and experience the region’s lush natural surroundings.