The coordinates of Chungcheongnam-do are 35°58’30”N on the southern end (Sindong-ri, Namil-myeon, Geumsan-gun), 37°03’44”N on the northern end (Nanjido-ri, Seongmun-myeon, Dangjin), 127°38’31”E on the eastern end (Bangwu-ri, Buri-myeon, Geumsan-gun) and 125°32’21”N on the eastern end (Gauido-ri, Geunheung-myeon, Taean-gun).
Chungcheongnam-do is in the center of the Korean Peninsula in terms of geographical coordinates. Chungcheongnam-do has four distinct seasons in terms of climate and the climate is part of the temperate monsoon climate zone of middle latitudes. Since Chungcheongnam-do is in the center of the South Korea region, Chungcheongnam-do, the gate of three southern regions to the southwestern and southeastern regions from times long past, is the transportation hub of Korea with National Road No. 1 to Seoul, Busan and Mokpo, Gyeongbu and Honam Line (Railroad), Gyeongbu and Honam Expressway, Gyeongbu and Honam Rapid Transit Railways and Seohaean Expressway passing through. Thus, it takes about one hour to get to Seoul, the capital of Korea, and is within three hours to Busan or Mokpo.
Chungcheongnam-do is 8,226km2 wide as of the end of 2017 which corresponds to 8.2% of total dimension of South Korea (100,339km2), making it the 6th broadest region following Gyeongsangbuk-do, Gangwon-do, Jeollanam-do, Gyeongsangnam-do and Gyeonggi-do. For area per city/province, Gongju covers the broadest area at 864.1 km2, and Gyeryong the smallest area at 60.7 km2.
The annual average temperature in Chungcheongnam-do is 12.9°C. It’s mostly mild and generally exhibits a continental climate. In particular, Chungcheongnam-do is colder than the regions along the East Coast on the same latitude because of fewer geographical barriers to block the northwestern wind during winter and has less snow cover in the areas along the northwest coast.
Located in the center of Korea, Chungcheongnam-do has a transportation network connected to any place in Korea. Chungcheongnam-do terrain is high on the east and low on the west around the Charyeong Mountains. The plains and hills, which are lower than 100m above sea level, account for over 60% of the total area of Chungcheongnam-do. The high mountains include Seodaesan (904m), Gyeryongsan (845m) and Daedunsan (878m). The big rivers include Sapgyocheon, Gokgyocheon and Muhancheon. The plains are well developed around rivers and the Geumgang River. The conventional rias coast, which is 953km long, is well developed. The bays are well developed including Garorimman Bay and Cheonsuman Bay due to the extreme tidal range.