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This research is in Penimbangan Beach, Baktiseraga Village, Singaraja District, Bali. Data was collected in August and September 2023 at two sites, one repetition. Used the underwater photo transect (UPT) method for coral data and the underwater visual census (UVC) method for fish. It is a unique coastal area with various ecosystem potential and has developed into a destination for marine activity. This beach has a natural coral reef ecosystem with great potential to develop into a marine tourism destination, especially for snorkeling. The determination as a snorkeling tourist area uses a tourism suitability index (TSI) matrix analysis by considering ecological parameters and water quality. The parameters measured in field observations are coral community cover, lifeform type, reef fish type, visibility, depth, current speed, and width of coral flatbeds. The coral community cover value at both sites was less than 25%, 19 types of lifeforms were found, and the flat area was around 80m2. The types of coral fish found were 52 species (site 1) and 48 species (site 2), with a total of 651 individuals divided into 17 families. High water visibility is 100%, and current speed is 0 cm/sec. The depth of the reef is between 3 m and 5 m. The tourism suitability index (TSI) for the snorkeling category is included in the unsuitable category; the scores for each site are 1.725 (site 1) and 1.495 (site 2).