Kim Quy Grotto or Golden Tortoise Grotto is situated on Dâm Nam Islet, with a peak 187 m above sea level. Dâm Bac Islet is in the front of the grotto and Soi Sim Islet in the back. The grotto is 100 m long and 5 to 10 m wide, running in a north-south direction. A narrow way leads to the interior of the grotto where a stream flows. The stalactites here are snow-white and lightly hang from the ceiling.