Located in the southeast of the Korat Plateau, "Thung Kula Ronghai" is a large-scale plain.The terrain is characterized by being a large pan basin with gradient less than 2%.
There are highlands around the edge of field which is gradually aslope to the middle region of the area. The area stretches crosswise along the Moon river with the maximum length measured by 150 kilometers and the maximum width measured by 50 kilometers. There are several main rivers, namely Lam Nam Siew, Lam Plub Pla and Lam Tao. The territory covers the areas of 51 sub- districts, 12 districts in 5 provinces, namely Roi Et, Surin, Si Sa Ket, Yasothon and Maha Sarakham accounting for 0.34 million ha. The area has physical, chemical and biological environments which are not suitable for doing paddy farming. As a result, products of rice and agricultural crops are very low. Therefore, Land Development Department entered the area to make a survey to classify the soil, make plans for land use and study how to solve the problems of soil, water and communication. The objectives for this are to develop the agricultural areas of Thung Kula Ronghai to be suitable with doing paddy farming and other agricultures of other aspects. It has been doing this since 1981 by initially establishing a pilot project in the area of 704 ha. This has been done by making a survey and designing the engineering infrastructure to be the water-controlling canal system in the paddy field or so-called "land remodeling" in order to mitigate flooding conditions. Water is drained from the area to reduce damages occurring to the rice tree. Moreover, water in the water drainage canal can also be used sufficiently in production. Ponds have been dug to store water to be used during the spell of rainy period. The soil and water conservation system has been constructed and maintained, and distribution of areas with saline soil has been reduced as follows: