A trip to Cat Ba island can done separately or in combination with a visit to Halong Bay. Cat Ba Island is the largest island in the Cat Ba Archipelago that consists of 350 limestone outcrops adjacent to Halong Bay. This is an oasis where you can be gone for one or for several days. If you start from the Halong Bay Wharf, it will take you four hours by boat, with stopovers for swimming, visiting spectacular karst WHAT IS "KARST"? and eating fresh seafood. You can contemplate the beautiful scenery of Halong Bay before reaching the island.