Vietnam is located in both a tropical and a temperate zone. It is characterized by strong monsoon influences, but has a considerable amount of sun, a high rate of rainfall, and high humidity. Regions located near the tropics and in the mountainous regions are endowed with a temperate climate.
Vietnam has a variety of mineral resources. Located beneath the subsoil are precious stones, coal and valuable minerals such as tin, zinc, silver, gold and antimony. Vietnam also has large deposits of oil and gas on its offshore islands and on the mainland.
At the beginning of the Bronze Age, the Viet tribe groups had settled down in the North and in the north of Central Vietnam. There were about 15 groups of Lac Viet tribesmen living mainly in the northern highland and delta and a dozen Au Viet groups of tribesmen living in Viet Bac, the northern region of old Vietnam.
In the 3rd century BC, the Han people who lived in the YellowRiver basin unified China, merging the various ethnic groups who lived in southern China to the south of the Yangtze River into a centralized empire. This feudal empire soon spread southwards.