Tan An city is located to the southwest of Ho Chi Minh City, 47 km from the city center and has the boundaries with the following administrative units: The North borders on Thu Thua district. The East borders Tan Tru district and Chau Thanh district. The West and Southwest borders Tien Giang province. The city has 9 wards and 5 communes with a total natural area of ​​8,192.64 ha, the population according to the 1/4/2011 census data is 180,000 people. In which ward 1 is the economic, political and cultural center of the city. Tan An city is the political, cultural, economic, scientific and technical center of Long An province. The city is both located on the development ray of the Southern Key Economic Area, as well as the economic gateway of the Mekong Delta provinces, with the main traffic axis running through the center is National Highway IA, National Highway No. Highway 62 and Vam Co Tay River. With the above geographical position, Tan An city has a comparative advantage in economic geography, contributing to promoting socio-economic development of Long An province in general and Tan An city in particular.

Tan An city is located in the tropical monsoon climate, sub-equatorial climate, high and stable temperature background. The climate is divided into two distinct seasons, the rainy season from May to November, the dry season from December to April. The annual average temperature is 27.9°C. Relative humidity is stable throughout the year with an average level of 79.2%. The average rainfall is 1,532mm, concentrating from May to November, accounting for about 91.7% of the total annual rainfall[1]. Hydrological The system of rivers and canals in the city is quite interlaced with the nuances of the Mekong Delta and influenced by the semi-diurnal tide regime of the East Sea. The maximum tidal range in the month is from 217 to 235 cm, the maximum tide in December is 150 cm. A tidal cycle is about 13-14 days. Due to the proximity of the sea mouth, large tidal amplitude, high tide at the beginning of the windy season, rivers and canals are often affected by saline intrusion[1]. In the flood season, Vam Co Tay river is both influenced by tides and also by floods in the Dong Thap Muoi region. In the dry season from February to June, Vam Co Tay river water is salty. May has the highest salinity of 5.489g/liter, January has a salinity of 0.079g/l. The pH in Vam Co Tay river water from June to August is about 3.8 - 4.3, so it cannot be used for production and daily life. Topographic Topography Tan An city has the common characteristics of the Mekong Delta. Here, the terrain is continuously and steadily accreted leading to the formation of a flat and horizontal plain. The absolute altitude varies from 0.5 to 2 m (Mui Nai system) and the average is 1-1.6 m. Especially exposed a sandy area from Tien Giang through Tan Hiep up to Xuan Sanh (Loi Binh Nhon) with the elevation often varying from 1–3 m[1]. Most of the existing residential land area is not flooded, scattered with low points along both banks of rivers and canals that are flooded in the rainy season. In general, the city's topography is relatively low, easily affected by high tide or when Dong Thap Muoi floods.

Surface water resources in Long An are quite abundant, the Vam Co Tay River, the section flowing through Tan An, has a length of 15.8 km, an average depth of 15 m, the main water source is from the Tien River through the Hong Ngu and Hong Ngu canals. The Grass. Bao Dinh canal from Vam Co Tay river connects Tien river in Ho Chi Minh City. My Tho. There are also Rach Chanh, Rach Chau Phe, Rach Binh Tam, Rach Can Dot. In general, surface water is not convenient for production and daily life due to salinity, alum and waste pollution. Rainwater of 1,200-1,600 mm/year is an important supplementary source for surface water[1]. The quality of groundwater in Tan An is considered to be quite good, meeting the standards for domestic use. The analysis results of some underground water samples in the city showed that the degree of H=5,3-7.8; C=8–200 mg/l; total iron content Fe= 1.28-41.8 mg/l. According to survey data and calculations of the Federation of 8 hydrogeologists, the underground water reserve of Tan An city is over 133,000 m 3 /day and night. Particularly in Khanh Hau ward, Tan An city, a mineral water mine at a depth of 400m is being exploited. Land The land in Tan An city changes strongly according to the topography. About 86.13% of the land area belongs to the group of sweet alluvial soils that are developing strongly, the rest is alkaline soil. Can be divided into 5 main types of soil as follows: Alluvial soil is developing organic-rich surface layer of 284.43 ha, accounting for 3.47% of the total natural area, scatteredly distributed over medium to slightly elevated terrain in Khanh Hau ward and An Vinh Ngai commune. . This type of soil is suitable for many types of crops, so it has a very high potential for diversification. Alluvial soil developed deep, typical, saturated with groundwater is 4,507.72 ha, accounting for 55.02% of the natural area. Soil developed from new alluvial materials, freshwater sediments has high topography and is distributed in large areas throughout the city. This soil is adaptable to a wide range of crops and has a very high potential for crop diversification. The alluvial soil developed deeply, saturated with groundwater is 1,994.09 ha, accounting for 24.34% of the total natural area. The sample is a new alluvial sediment, formed and developed in the freshwater environment, distributed on high terrain, scattered throughout the city. Potential acid acid soil is 267.43 hectares, accounting for 3.26% of the total natural area. Distributed on average terrain in Ngai Loi B hamlet, Loi Binh Nhon commune, Huong Tho Phu and along Vam Co Tay river. The active acid acid soil is 152.19 ha, accounting for 1.86% of the total natural area, distributed in the center of Huong Tho Phu commune, with low average terrain compared to the surrounding area. As an area formed for a long time, most of the natural land area of ​​Tan An city is used for socio-economic development purposes. Although it is the provincial capital of Long An province, most of the natural land area is allocated for agricultural purposes (about 72%). The area of ​​specialized land accounts for less than 11%. The total land area used for urban areas accounts for about 27% of the total natural area. The level of urban development in the city is relatively low, not meeting the requirements of being the center of a province. Humanities Formed in the late 17th decade from many sources, the community of Tan An city has diverse knowledge, skills, production experience and folklore capital. Although the size is not large, but Tan An city is also quite famous in the South for its unique features of scenery, living style, and a place of cultural and artistic convergence imbued with national identity. This is also home to many historical and cultural relics such as Nguyen Huynh Duc's mausoleum and nearly 100 temples, shrines, holy houses... Population The population of the city is 132,570 people (April 1, 1999), of which 98,157 people, accounting for 74%, and 34,413 people, accounting for 26% of the city's population. The average population growth rate in the period 1989-1999 was 1.27%, lower than the provincial average (1.55%). The average population density of the city is 1,636 people/km 2 , 5.25 times higher than that of the whole province (300 people/km 2 ). Working age in 1999 was 71,927 people, accounting for 63% of the population, of which laborers in sector I accounted for 28%, workers in sector II accounted for 13.6% and workers in sector III accounted for 42. % of the total number of employees, showing that the level of production participation of the trade - service sector is quite high. The average annual increase in labor force is about 2,800 people/year, of which the unemployment rate gradually decreased from 11,034 people (18%) in 1991 to about 4,479 people (7%) in 1999.