TOPSHOT - This aerial photo taken from a helicopter shows a tourist boat sailing on the waters of Ha Long Bay in northeastern province of Quang Ninh on May 10, 2019. - Most visitors to Vietnam's Ha Long Bay opt for cruise views of the UNESCO heritage site but from May 10, tourists can opt for a helicopter ride to see the area's famous karsts from the skies. (Photo by Manan VATSYAYANA / AFP)