It is important to recognize and evaluate the ecological niche and geographical habitat of species for understanding the biogeographic distribution pattern of them. The objectives of this study were to identify the spatial distribution and ecological niches of three brown frog species (Rana dybowskii, R. coreana, and R. huanrensis) using geographic information system (GIS) and examine the habitat environment in the contact zone of these species by predicting the geographic distribution based on a species distribution model. The results of this study showed that the brown frog species showed different distribution range along Taebaek Mountains and the altitude was an important variable affecting their distributions. Moreover, the altitude was significantly correlated with the climate conditions of the region. Although the ecological niches of three species were highly overlapped, the overlapped geographical area was very small compared to the entire study area. The brown frog species showed a parapatric distribution pattern and the overlapping habitats were mainly forests and farmlands. It was not possible to identify precise causal factors affecting the parapatric distribution among the species. However, it is believed that it will be possible to find specific reasons why they showed a parapatric distribution if more detailed analysis (grid size=500m or less) is performed for various environmental factors.