Native name: நல்ல தண்ணி தீவு | |
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| Geography | |
| Coordinates | 9°06′24″N 78°34′44″E / 9.10667°N 78.57885°E |
| Area | 1.01 km2 (0.39 sq mi) |
| Highest elevation | 11.9 m (39 ft) |
| Administration | |
India | |
| State | Tamil Nadu |
| District | Ramanathapuram |
| Taluk | Kadaladi taluk |
Nalla Thanni Theevu (Tamil: நல்ல தண்ணி தீவு) is an island situated in the Gulf of Mannar about 4 kilometers south-east of the coast of Tamil Nadu, India. It is one of the three uninhabited islands in the Gulf of Mannar the others being Krusadai Island and Muyal Island.[1] It forms a part of the Kadaladi taluk of Ramanathapuram district.
