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北部湾自雷州半岛西侧和现在的广西海岸延伸到越南北部和中部。这个半月形的海湾自然地将海南岛的西岸包括在内。在北部湾13万平方公里的范围内散落着许多港湾和岛屿。与大陆东南亚海岸的其他部分相比,北部湾在2000多年前就达到了目前的海平面,而泰国和马来西亚半岛在之后的500年才达到如此高度。湄南河和湄公河三角洲地区的海平面形成最晚。1今天的河内地区,也被称为河内谷(Hanoi Valley),很久以前就有人类居
Beibu Gulf extends from the west of Leizhou Peninsula and the present Guangxi coast to northern and central Vietnam. This half-moon bay naturally includes the West Bank of Hainan Island. There are many bays and islands scattered throughout the Beibu Gulf within a 130,000-square-kilometer radius. The Beibu Bay reached its current sea level more than 2000 years ago, compared to the rest of the continent’s southeast coast, before Thailand and the Peninsula of Malaysia reached such a height in the next 500 years. The sea level has been formed lately in the Chao Phraya and Mekong Delta regions. 1 Today’s Hanoi area, also known as the Hanoi Valley, has long been home to humans