National Primary Route 18, or just Route 18 (, or ) is a National Road Route of Costa Rica, located in the Guanacaste province.
Description In Guanacaste province the route covers Nicoya canton (Mansión and Quebrada Honda districts), Cañas canton (Porozal district), and Abangares canton (Las Juntas and Colorado districts).
The La Amistad de Taiwán Bridge, which was financed, designed, and built by Taiwan, is located on this route.
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