The exceptional scenic beauty of this area stems from its limestone karst towers, now islands, which rise as spectacular pillars and exhibit coastal erosion features like arches and caves, contributing to the majestic natural scenery. Halong Bay, previously recognized twice by UNESCO (1994 & 2000), now forms part of the ‘Ha Long Bay – Cat Ba Archipelago’ World Natural Heritage site, designated in 2023. Cruises offer visitors the chance to explore caves, beaches, and lagoons, all set against these iconic and magnificent vistas.