The island of Sumatra, with its 473,000 km², is the sixth largest island in the world. The island belongs to Indonesia and has beautiful nature above and underwater..
The caves of Sumatra, Indonesia
![The caves of Sumatra, Indonesia | aquasport.tv](https://www.aquasports.tv/wp-content/uploads/2016/04/Scuba-Diving-248.png)
The island of Sumatra, with its 473,000 km², is the sixth largest island in the world. The island belongs to Indonesia and has beautiful nature above and underwater..