Rivers of Costa Rica

Drainage basins and major rivers

Rivers are usually described by the coast they reach. The Caribbean drainage collects water from the Atlantic slopes of the central ranges; the Pacific drainage includes the northern Pacific (Gulf of Nicoya) and the southern Pacific basins. One important transboundary watercourse, the San Juan River, forms part of the border with Nicaragua and has been the subject of international agreements.

• Selected rivers draining to the Caribbean:
  • San Juan
  • Reventazón
  • Pacuare
  • Sarapiquí
  • Parismina
  • Matina
  • Sixaola
  • Tortuguero
• Selected rivers draining to the Pacific:
  • Tempisque (Gulf of Nicoya)
  • Tárcoles
  • Térraba (Térraba–Sierpe system)
  • Savegre
  • General / Coto Brus (southern Pacific systems)

These lists highlight prominent rivers and river systems; for full, detailed catalogues and the hierarchical arrangement of tributaries consult official registers and hydrological maps here.

Characteristics, uses and conservation

Costa Rican rivers are fed by orographic rainfall along the cordilleras and often have steep gradients suitable for whitewater recreation—Pacuare and sections of the Reventazón are internationally known for rafting. Rivers supply water for irrigation, support hydroelectric projects and sustain extensive estuarine and mangrove habitats that are important for fisheries and coastal protection.

Many rivers flow through protected areas or form part of national parks and biological corridors, contributing to high freshwater biodiversity. Conservation challenges include deforestation in catchments, sedimentation, pollution from agriculture and impacts of infrastructure; a careful balance between development and watershed protection is a continuing policy concern.

Historical and legal context

Historically, rivers served as transport arteries and natural boundaries. The San Juan River in particular has figured in diplomatic and legal arrangements with neighboring Nicaragua. Modern water management in Costa Rica combines national regulation, protected-area management and local watershed organizations to address flood risk, water supply and ecosystem services.

For an ordered listing showing primary streams and their tributaries, and for maps used by researchers and planners, see the tributary-index and cartographic resources available here.