The Emerald Triangle is located in the southern part of the northeastern region. Thewhole region covers 160,000 km2. It is located on the Khorat Plateau, which slopes down from the Phetchabun mountain range in the west toward the Mekong River and the Laotian border. The plateau is composed of two plains separated by the Phu Phan mountains. The northern Sakon Nakhon plain is drained by the Loei and Songkhram Rivers, while the southern Khorat plain is drained by the Mun and Chi Rivers. The Chi River flows through the center of the region before turning south to meet the Mun in Si Sa Ket Province. The Mun River rises in Khao Yai National Park and runs east to join the Mekong in Ubon Ratchathani Province. Table 10, Table 11, and Table 12 present some characteristics of the four related provinces (shown in Figure 4). Land usage and major agricultural products are shown in Table 10 and Table 11. Table 12 shows the gross domestic, regional, and provincial products, population and population density, the rank of the country and the region as well as the major sectors that contribute to the GPP.