This recently discovered grotto is perhaps the most beautiful grotto in all of Ha Long bay. Thien Cung is situated on the south-west site of the bay, 4km from the wharf outside of Ha Long city.

It is found in a small range of island that resemble a throne embracing two superb grottoes at its core. The way to Thien Cung is a bit strenuous, going up a path covered on both sides by thick forest. Bu it is very rewarding: after entering a narrow gate, the magnificent, 130m-long grotto opens up.

In the centre there are four large pillars supporting the "roof of heaven". Under the immeasurably high roof, stalactites form a natural stone curtain. And the wind blowing through the stone produces the sound of a beating drum.

In the last chamber of the grotto babbles a natural gushing stream of water and there are three small ponds of clear water. On the path meanders out of the grotto.