Seagrass beds in the waters of Barrang Lompo Island and Kodingareng Lompo have their own characteristics, especially for the type of Thalassia hemprichii. The purpose of this study was to determine the morphometric characteristics of seagrass Thalassia hemprichii and the environmental conditions of the waters on Barrang Lompo Island and Kodingareng Lompo Island. This research was conducted in June-July 2022 in the waters of Barrang Lompo Island and Kodingareng Lompo Island. The research method used was purposive sampling. Morphometrics of seagrass Thalassia hemprichii on Barrang Lompo Island at station 1 average leaf length 10.88 cm, leaf width 1 cm, rhizome length 5 cm, root length 6.46 cm, number of roots 8. At station 2 leaf length measures 7.5 cm, leaf width 1 cm, rhizome length 7.84 cm, root length 6.64 cm and number of roots 5. Meanwhile on Kodingareng Lompo Island at station 1 the size of leaf length was 10.33 cm, leaf width 1 cm, rhizome length 4 cm , root length 4.33 cm and number of roots 5. At station 2 the size of leaf length was 9.63 cm, leaf width 1 cm, rhizome length 4.85 cm, root length 4 cm, number of roots 5. Morphometrics of seagrass Thalassia hemprichii on islands Barrang Lompo and Kodingareng Lompo islands did not show a significant difference. The environmental conditions of the waters on both islands are still in optimum conditions for seagrass growth for the parameters of current speed and brightness.

Coastal areas and sea have the potential biological resources large enough, because supported by three main ecosystem the ecosystem mangrove, seagrass beds and coral reefs. To maintain the existence of the ecosystem, control in coastal areas need to conducted one of them is inventory damage ecosystem especially ecosystem coral reefs. On the island of Bungkutoko lack or information on the coral reefs ecosystem is the island Barrang Lompo in addition the information and data on the ecosystem.  The purpose of this research is to get data teachers’ marital status and a condition of damage the ecosystem to coral reefs as a second the island. The research results obtained, a covering of coral reef island Bungkutoko depth 5m and 10m namely 36,47% and 41,67% category ‘being’. The island Barrang Lompo station 1 the depth of 5m and 10m namely 38,67% and 42,53% category ‘being’, station 2  covering 23,27% category ‘broken’. To scattery if coral reefs Bungkutoko island 231.31 ha, the Barrang Lompo island 127.47 ha. The level of damage/index mortalities on the island of Bungkutoko depth 5m and 10m namely 0,5593% and 0,6201% category ‘being’. The island Barrang Lompo station 1 depth 5m and 10m namely 0,6011% and 0,5504% category ‘being’, station 2 the level of damage/index mortalities 0,7326% category ‘high’.