Muara Nauli Beach area has a charm in the form of a sloping white sandy beach and is broad enough and the waters aspects are conducive to being a marine ecotourism. This research was conducted in December2019 at Muara Nauli Beach, Sorkam Sub-district, Central Tapanuli District. The purpose of this study is to assess the suitability and carrying capacity of the area in Muara Nauli Beach as a marine tourismdestination. The method using are calculate of tourism suitability index and carrying capacity with geographical information system technology. The data used are primary data and secondary data. Primary data were obtained from field observations and interviews. Whereas secondary data was obtained from related institutions. The results obtained from the tourism suitability index for beach recreation tourism are the "suitable" category with an area of 7.24 Ha and the "conditional suitable" category with an area of 357.04 Ha. For swimming tourism of "suitable" category with an area of 320.3 Ha and "conditional suitable" category with an area of 51.52 Ha. The total carrying capacity of the region for swimmingtourism in one day is 43 people and for beach recreation tourism is 463 people. Therefore, the Muara Nauli Beach is feasible to be developed by the government to be used as marine ecotourism such as beachrecreation tourism and swimming tourism.
                        
                        
                        
                        
                            
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