Answer : Yes, it is

Giải thích : Theo thông tin, Tuan Chau is the biggest island in Ha Long Bay.

  Ha Long Bay is in Quang Ninh province .It has many islands and caves. The islands are named after things around us. In the bay you can find Rooster and Hen Island and even Man's Head Island. You must take a boat ride around the island essential! Tuan Chau is the biggest island in Ha Long Bay. You can enjoy great Vietnam seafood . You can join exciting activities. Ha Long Bay is Vietnam's most beautiful natural wonder.

Question:

 Is Tuan Chau the biggest island in Ha Long Bay?

-Yes, it is.