Ansan is a city in Gyeonggi Province, in South Korea. It is south-west of Seoul. A train connects Ansan and Seoul. Ansan is by the Yellow Sea.
Five universities are in Ansan. Many people from other countries come to Ansan to live and work.

The first people lived in Ansan 12,000 years ago. There are very old graves. They found older things in 1995 when they built a road.
We do not know much about Ansan before 900. Ansan was part of Taebong in 900. The ruler of Taebong was killed in 918. Then, Ansan was part of Goryeo.
Ansan was part of Gyeonggi Province in 1392. Ansan produced fish in 1396, and produces fish and salt now.
Today, 600,000 people live in Ansan. It has two districts, Danwon and Sangnok.
Ansan is in the south-west of Gyeonggi Province. It is by the Yellow Sea. Daebudo and Pungdo are islands to the south. Gunpo is a city to the east. Anyang is a city to the north-east. Siheung is a city to the north. Hwaseong is a city to the south.
Ansan is hot and wet in summer. It is cold and dry in winter.
Universities in Ansan:
Ansan has 24 high schools, 29 middle schools, 54 elementary schools, and 96 kindergartens. Many children from Danwon High School were on the MV Sewol. Ansan West Elementary School has many children from other countries.