Trong Mai Islet is a famous islet on Halong Bay. Trong Mai Islet has become a symbol of Halong Bay and also Vietnam's tourism. It can also be found with the name 'Ga Choi Islet' (rock of 'the fighting cocks').

Trong Mai is situated on the south-west side of Ha Long Bay, 5 km from the tourist wharf near to Dinh Huong Islet.Their tiny legs support heavy bodies, and it appears that one strong wave could throw the two stone blocks into the sea. However, hundreds of millions of years have passed, and the Trống Mái is still there. It has the shape of a cock couple rising from the blue sea. These two huge cocks have stood by the other for thousands of years. As the story told by the locals, Trong Mai Islet represents for faithfulness of love.

The islet is most beautiful at dawn, when the sun sheds the first shine of a day and light up the cock couple.

In a somewhat large expanse of open sea, Trong Mai Islet seems to grow up from the bottom of the deep emerald waters. At sunset, Trong Mai Islet is bright red and in a somewhat tottery position.