The location of Costa Rica on the Central American Isthmus creates unique microclimate systems that receive moisture inputs directly from the Caribbean Sea and the Pacific Ocean. In Costa Rica, stable isotope monitoring was conducted by the International Atomic Energy Agency and the World Meteorological Association as part of the worldwide effort entitled Global Network of Isotopes in Precipitation. Sampling campaigns were mainly comprised of monthly-integrated samples during intermittent years from 1990 to 2005. The main goal of this study was to determine spatial and temporal isotopic variations of meteoric waters in Costa Rica using historic records. Samples were grouped in four main regions: Nicoya Peninsula (d2H = 6.65d18O －0.13; r2=0.86); Pacific Coast (d2H = 7.60d18O+7.95; r2=0.99); Caribbean Slope (d2H = 6.97d18O+4.97; r2=0.97); and Central Valley (d2H = 7.94d18O+10.38; r2=0.98). The water meteoric line for Costa Rica can be defined as d2H = 7.61d18O+7.40 (r2
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