1. The specialty of a local culttire is determined by history, geographical environment and orally transmitted folk tales of the region. A geographical area which has cultural similarities could be called a cultural area, for example, the Seoul Cultural Area, the Andong Cultural Area and so on. 2. This article is to find out some cultural specialty of Chongju region in Choongbuk Province, through studying folk tales of the region. There are many relics and remains of the period of Three Kingdoms since the region was once an arena of heavy competition among the Three Kingdoms. Famous are the mountain fortresses among them. And there are many folk tales related with these fortresses. 3. In this paper the folk tales related with the mountain fortresses are called "hill-fort legends". Among them a tale of "A Brother and Sister`s Hard Effort", which is about a mountain`s Goddess and her son, a heroic Hcrcules, is selected out and studied intensively since it is a good source for studying a myth. 4. Some folk tales of other regions were also distributed in this area with some revision. They were changed in a way to fit to history and the customs of this region. So we could designate Chongju area a a special region in terms of folk tale. This article is an extensive study of library research and orally transmitted tales, giving special attention to the abovementioned characteristics.