Binh Thuan province in the East.

With the provinces of Ba Ria - Vung Tau and Ho Chi Minh City.

North of Lam Dong and Binh Duong.

Dong Nai lies in the monsoon tropical zone and is affected by the north-east and south-west monsoon. It is also put under the influence of Pacific Ocean tropic atmosphere between April and October. There are two distinct seasons: the rainy season lasts from March or April to November and the dry season from December to March or April of the following year. Average temperature goes between 23.9 – 29oC, much lower than standard level of the tropical regions (26-30oC). Its rainfall is quite high with 1,500 mm – 2,700 mm.

On average, the weather is sunny for 4-9.5 hours a day and does not exceed 11.5 hours per day, even on the hottest and sunniest days. Total rainy days within a year are between 120 - 170 days (standard level of tropical region is 150 - 160 days) with total rainfall of some 1,500 - 2,750 mm. The average humidity is around 80 - 82% and humidity in the dry season is 10 - 12% lower than that of the rainy season. The humidity is inconsiderably different among the areas. Dong Nai Province's weather with regular sunshine, rain and high humidity equally found in the
localities facilitates agricultural production and development of industry and cultural and tourism activities.

Land resources: Dong Nai is the province which possesses the largest area of agricultural land in the eastern region of South Viet Nam. There are 5 main groups of soils classified by FAO/UNESCO. Cultivation land is mostly composed of basalt soil suitable for development of for industrial plants and fruit trees.

Water resources: Dong Nai has a relatively abundant surface water with average density of 0,5 – 1,2 km of river/km2, but unevenly distributed. Most of rivers and springs are concentrated in the northern region and along the Dong Nai River in the south-western region. There are 2 main rivers, i.e. Dong Nai, 220 km and La Nga, 70 km, providing water for utilization and waterways. Other large rivers are La Buong, Thi Vai, Ray, and Dinh. Total water volume is 25.8 billion m3 a year, varying from 85-90% to 10-15% in the respectively rainy and dry season. The underground water for industrial purpose is not abundant, concentrating in the south of Long Thanh district and the north of Bien Hoa City. There are 5 sites having mineral water, including Suoi Nho where the reserve may reach 10,000m3/day.

Mineral resources:

• Metalliferous mineral group: There are 19 mines and 2 ore sites, comprising 2 laterite bauxite mines, 17 gold mines and ore sites, some sites having signs of mineralized lead – zinc, gold – silver, and caciterit ore of low content.
• Non – metal minerals: Non-metalliferous mineral group: kaolin, natural colour powder, limestone, quartz, construction materials such as stone, sand, clay, puzzolan.

Forestry resources:

Dong Nai abounds in forest with 153,586 ha, accounting for 30% of the provincial area. It has a diversified ecology with 614 species of plants and 250 species of animal. This a favorable condition for development of ecological environment, tourism, and exploitation of forest products.

Forests have basic characteristics of tropical forests with a varied fauna and flora, as represented by Nam Cat Tien National Park, a natural reserve region rich in rare and precious animal and vegetal species with the implementation of the present program for forest cultivation (including the cultivation of perennial industrial trees). In 1976 forests covered 47.8% of the provincial natural area, decreasing to 21.05% in 1981.