Ha Long city is located in the center of Quang Ninh province, 165 km east of the center of Hanoi capital, 70 km northeast of Hai Phong city center and 184 km from the border city of Mong Cai. southwest.[7] The city is geographically located: To the east, it borders Cam Pha city and Van Don island district The West borders Uong Bi city and Quang Yen town To the south, it borders Cat Hai district, Hai Phong city and the Gulf of Tonkin. The North borders Son Dong district, Bac Giang province and Ba Che district.[9] Ha Long city has an area of 1,119.36 km², population in 2018 is 300,267 people[3], population density reaches 268 people/km². The natural area of the city includes the land area and hundreds of limestone islands in the bays of Ha Long, Bai Tu Long and Lan Ha[9]. Thus, at present, Ha Long is a provincial city with the largest area in the country, larger than the area of the three smallest provinces of Bac Ninh, Ha Nam, Hung Yen and approximately the area of the central city of Da Nang. . According to the 2019 census, the city’s population is 322,710 people
Ha Long city belongs to the coastal climate zone, with 2 distinct seasons: winter and summer. The average annual temperature is 23.7 °C. Winter usually starts from November to April next year, the average temperature is 16.7 °C, the coldest is 5 °C. Summer from May to October. The average temperature in summer is 28.6 °C, the hottest can be up to 38 °C. The average annual rainfall of Ha Long is 1832 mm, unevenly distributed in 2 seasons. In summer, it rains from May to October, accounting for 80-85% of the total annual rainfall. Rainfall is highest in July and August, about 350mm. Winter is the dry season with little rain. From November to April next year, it only reaches about 15-20% of the total annual rainfall. The least rainfall is in December and January, only about 4 to 40 mm [11]. The average annual humidity is 84%. At the same time, the climate in Ha Long has two distinct types of monsoons: Northeast wind in winter and Southwest wind in summer. Ha Long is a closed sea, so it is less affected by big storms, the strongest wind in storms is usually level 9, level 10.
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