A UNESCO representative awards a certificate recognizing Ha Long Bay in Quang Ninh province and Cat Ba Islands in Hai Phong city as the first inter-province-city World Natural Heritage Site in Vietnam. Photo: VOV.

Ha Long Bay-Cat Ba Archipelago is a natural masterpiece viewed from the sky. Photo: VTCNews.

Vietnam's Department of Cultural Heritage said that the Ha Long Bay-Cat Ba Archipelago is considered a geological museum, containing heritage with exceptional global value. It is a place that witnessed significant changes in the history of Earth's development. Photo: catba.com.vn

Ha Long Bay-Cat Ba Archipelago boasts seven adjacent tropical and subtropical marine island ecosystems. Photo: Truong Giang/VOV.

The beauty of Ha Long. Photo: Truong Giang/VOV

Tourist boats on Ha Long Bay. Photo: Vietnam National Tourism Administration

Amidst the limestone mountains, hundreds of floating houses on Lan Ha Bay create a stunning landscape. Photo: Dong Giang/baoquangninh.vn

The Cat Ba Aarchipelago seen from above. Photo: Minh Duc/VNA

Operating since 2019, the ferry connects two wharves: Tuan Chau island (Ha Long city, Quang Ninh province) and Cat Ba island (Cat Hai district, Hai Phong city). Spanning about 7km, it serves as a scenic route for passengers. Photo: Truong Giang/VOV

The ferry travel time is about 1 hour, with 10 trips per day in summer and 6 trips per day in winter departing from both wharves. Photo: Truong Giang/VOV

The Tuan Chau-Cat Ba ferry is a preferred option for many travel agencies to transfer tourists to Cat Ba. Photo: Truong Giang/VOV