Monkey Island, under the management of Cat Ba National Park, has been included in tourist attraction point for many years. It used to be called Cat Dua island because of the presence of a large number of wild pineapples. The name was later changed to Monkey Island as dozens of macaques introduced for tourism and they often come to the beaches to play with tourists.

This is a mountainous, sandy island formed by millions of waves and winds bringing sand, rocks, coral, shellfish, shells, shrimps and crabs to the foot of the mountain. You can see the sandy beach stretch for miles. Cat Dua Island is also an ideal place for swimming with blue water and yellow sandy shores.