“Yato” is a landscape unit that is horseshoe-shaped flatland surrounded by the hill in three directions. In the hilly cities, such as Yokohama, many Yatos can be seen. Some previous researches mention about the importance of Yato from the perspective of ecological, hydrological, thermal environmental and social aspects. This study aims to developing the method for making Yato map by using GIS and DEM, and also classifying all Yatos based on the land use in Yokohama. By comparing previous researches, it becomes clear that this method is suite for making Yato map. Actually, Yato map is made in Yokohama and 4657 Yatos are extracted. It was also found that about 50% of all Yatos are already developed as low-rise residential areas, and about 30% are still undeveloped, by overlaying Yato map and land use map. Evaluating each Yatos from the perspective of natural and social environments will be needed as a future work.