The results of the 4th National Ecological Survey reflect the latest status of the ecological environment in South Korea. In this study, we presented spatial data on the distribution of mammals collected through the 4th National Ecological Survey in the southwestern area of the Korean Peninsula, covering Jeollanam-do, Gwangju Metropolitan City and Jeju island. The data consists of information on mammal individuals recorded at the site and information on characteristics of abiotic environment at the recorded points, including spatial units (administrative districts, digital map index, etc.) which are necessary for statistical analysis. The data have high policy and research values because it can elaborate on the descriptive characteristics of the distribution points and identify the relationship between individual abundance and habitat environment. However, when data is utilized in a regional scale, it should precede to consider the survey system, such as how to select the survey area.
