Geographical Information System (GIS) is a computer system used to collect, examine, integrate, and analyze information related to surface of the earth. One of the benefits of using GIS is to determine the suitability of a marine tourism area, which is the purpose of this study, the results showed that the Pinangsori sub-districts "Appropriate" and "Conditionally Fit" to be developed for marine tourism namely for diving tourism (42,29 suitable; 49,68 Ha conditionally suitable) and fishing tourism (49,01 Ha suitable; 100,45 Ha conditionally suitable). Regional carrying capacity of 94 people/day for diving and 8 people/day for fishing tourism.
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