Because of the agglomeration of population, the valley is the center of commerce, industry and service activities, just helped by ports on both coasts, and by Liberia in Guanacaste (which has the other international airport besides Juan Santamaría Airport in Alajuela) that have similar economic movement.
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The Central Valley is commonly considered to extend from the city of San Ramón in Alajuela in the west, to the city of Paraíso in Cartago in the east.
An insect pest, common to Guanacaste trees of the Costa Rican Central Valley, produces spherical green galls of 1.5 cm diameter on new shoots in February and March.
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