Halong Bay is Vietnam’s best known natural wonder. Located in north-east Vietnam, in the Gulf of Tonkin, Halong Bay is comprised of 1,969 islands of varied sizes and shapes. 989 of the islands have been given names. Many of the islands are limestone while some are formed from Schist. In 1994, the Committee of World Heritages of UNESCO (an agency of the United Nations) officially designated Halong Bay a natural heritage site of global significance.
The weather of Halong Bay is marked by two distinct seasons. The hot and wet summer season runs from May through October. During the summer, the temperatures average between 24-33 degrees with rainfall averaging approximately 238mm. The cool and relatively dry winter season begins in November and lasts through April. Winter temperatures range from 16-23 degrees and precipitation only averages approximately 41mm during this period.