Hon Co Island is also known as Grass Island. As its name suggests, the island is covered with thick green foliage of grass, shrubs and other plant species growing on limestone cliffs. The island is located in Cong Do area, one of the most magnificent and appealing tourist attractions in Bai Tu Long Bay. Hon Co Island has recently welcomed tourists since Thien Canh Son Cave on this island was open to the public. Therefore, the island still retains its amazing original beauty.