Two best SEA Games athletes offered free tours to Son Doong Cave

Authorities in the central province of Quang Binh are offering free expedition tours to Son Doong, the world’s largest cave, to the two most outstanding athletes at SEA Games.

Source: VNExpress International,
https://e.vnexpress.net/news/travel/two-best-sea-games-athletes-offered-free-tours-to-son-doong-cave-4462166.html