100 years Botanical Garden was established in 1996 on the occasion of the Royal Forest Department's 100th anniversary by using the area of ​​Khao Ang Rue Nai Wildlife Sanctuary, amounting to 8.87 square kilometers on the side of Khao Takrub, Wang Nam Yen District Sa Kaeo Province and Sanam Chaikhet District, Chachoengsao Province. The objective was to collect the plants of the eastern region for botanical research and as a natural resting spot. The area of ​​the Botanical Garden is sandstone mountains interspersed with plains at the foothills. The soil is clay mixed with laterite, an altitude of 300 meters to the peak of the mountain, which is about 760 meters high. The condition of the area is dry evergreen forest which is the most forest condition of the forest bordering the 5 provinces of the eastern region, namely Chanthaburi, Rayong, Chonburi, Sa Kaeo (Prachinburi) and Chachoengsao. Most of the plants are dry evergreen forests such as Tabak Yai, Yang Na, Macha Mong, Takhianthong, Krathum Nam, Kolan, Pikulpa, Krabok, Sompong, Krabak, and Kratong, etc. From the initial survey, it was found that the plants in the natural forest are classified into 86 families, 381 species for plants grown in botanical gardens, both academically and grown as ornamental plants or herbaceous plants in general. Until today, 103 families, 818 species have been collected. The plots gather plants according to plant taxonomy, which are 16 families, namely Mangosteen (GUTTIFERAE), Trotters (APOCYNACEAE), Palm (PALME), Yang (DIPTEROCARPACEAE), Ylang-Ylang (ANNONACEAE). ) Wong Maai (GENTACEAE), Wong ebony (EBENACEAE), Wong Mango (ANACARDIACEAE), Wong Orange (RUTACEAE), Cinnamon (LAURACEAE), Wong Pao (EUPHORBIACEAE), Wong Bon (ARACEAE), Wong Khae (BIGNONIACEAE), Wong Sai (MORACEAE) and Wong Maki. NS (BURSERACEAE) There are activities and guidelines for the development of the garden, activities and operations of the Botanical Garden for 100 years, the Royal Forest Department, in addition to planting and maintaining trees. Another important activity is plant research, and a plant chamber for collecting plant specimens in the area and the eastern forest ginger. It collected approximately 1,500 specimens of dry herbarium specimens, and approximately 1,000 spirit collections within the herbarium building. There is also a visualization of plants. There are also 2 nature trails along with outdoor activities for youth activities.