 The largest island is the Laurel Mountain (Guishan, 桂山) Island, which was formerly known as Trash Tail (Lajiwei, 垃圾尾) Island.Other major islands include Outer Linding (Wailinding, 外伶仃) Island, Dong'ao (东澳) Island, Tri-gate (Sanmen, 三门) Island, Greater Ten-thousand Mountain (Da Wanshan, 大万山) Island, Lesser Ten-thousand Mountain (Xiao Wanshan, 小万山) Island, Burden Pole (Dangan, 担杆) Islands, and Jianpeng (佳蓬) Islands.After Hainan Island had fallen into the communist hands, the nationalist 3rd Fleet withdrew to Wanshan Archipelago and together with the various nationalist units as the local garrison, the nationalists planned to blockade the mouth of the Pearl River and cutting off the maritime links between the mainland and Hong Kong and Macau.