Basic information and general status of Koh Chang Subdistrict Administrative Organization.

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1. Location

Koh Chang Subdistrict is located in the northern part of Thailand, in Mae Sai District, Chiang Rai Province, east of Mae Sai town.

Along the Mueang Daeng - Thung Kliang road, for a distance of approximately 7 kilometers, it borders the following sub-districts:

          To the north, it borders the Union of Myanmar, with the Ruak River serving as the border.

          To the south, it borders the Sri Mueang Chum sub-district, Mae Sai district.

          To the east, it borders the Sri Don Mun sub-district, Chiang Saen district.

          To the west, it borders Mae Sai Subdistrict, Mae Sai District.

Area of Koh Chang Subdistrict

          Koh Chang Subdistrict has an area of approximately 47.35 square kilometers, or about 29,593 rai, which is about 16.62 percent of the area of Mae Sai District.

    - Residential areas account for 30.82 percent of the subdistrict's area.

    - Agricultural land/occupational areas account for 65.23 percent of the subdistrict's total area.

    - 8.66% of the subdistrict's area is designated as public land.

1.2 Topography/Climate

       The area of Koh Chang Subdistrict has a topography consisting of flat and hilly terrain, which can be classified as follows:

          - The upper northern area is a valley plain along the banks of the Ruak River, used for agriculture and home to communities in Villages No. 6, 11, 5, 10, 9, 7, 12, 1, and 2 of Koh Chang Subdistrict, listed from west to east.

          - The lower southern area is a valley plain continuing from the upper area. It is agricultural land and the location of communities in Villages No. 8, 4, 13, and 3 of Koh Chang Subdistrict, listed from west to east. The general topography is a floodplain due to inadequate drainage caused by floodwaters flowing from Myanmar, combined with heavy rainfall during the rainy season accumulating in the Mae Sai, Mae Ruak, and Mae Ma rivers. The large volume of water cannot flow into the Mekong River quickly enough because the Mekong River receives water from various sources, especially China, Myanmar, and Laos. This results in high water levels and inability to drain the water in time, causing the river to overflow its banks and flood agricultural areas in the subdistrict every year.

1.3  Characteristics of the soil

        The majority of the soil in Koh Chang subdistrict is loamy clay, which is suitable for agriculture. There may be some areas with soil quality issues, specifically hardpan, gravel, and sand.

1.4  Characteristics of water sources.

        The majority of water sources in Koh Chang Subdistrict are groundwater wells, waterfalls, and drilled wells, totaling approximately 1,610. Following this are rivers, canals, dams, weirs, swamps, irrigation canals, reservoirs, shallow wells (usable), and ponds (100 square meters or more).

2. Number of villages: 13 villages.

            -  The sub-district administrative organization area comprises 13 villages, namely villages 1-13.

          -  There are no villages located within the partial area of the sub-district administrative organization.

Village No. 1, Ban Pang Ha

Village No. 2, Ban Sanna

Village No. 3, Ban San Bun Rueang

Moo 4, Ban San Luang

Village No. 5, Ban Pa Daeng

Moo 6, Ban Pa Sang Ngam

Village No. 7, Ban Muang Kham

Village No. 8, Ban Mueang Daeng Noi

Village No. 9, Ban Sri Pa Daeng

Village No. 10, Ban Srichaiphumi

Village No. 11, Ban Pa Daeng Luang

Village No. 12, Ban Rong

Village No. 13, Ban San Luang Tai