Abstract
On the eastern slopes of Zao Volcano, there are three hot-spring spas along the road leading from Sendai city to Zao Volcano. They are Tokatta, Aone and Gaga. In April, 1963, for the development of tourist industry, the whole line of Zao-Highway was opened to traffic from Tokatta to Kaminoyama city, Yamagata Prefecture, via the top of Zao Volcano. Since then, the tourists visiting these spas have been rapidly increased. For example, in the case of Tokatta, the visitors increased from 58, 500 in 1961 to 146, 000 in 1963. At the same time, the areal distribution of the visitors' homes has become more extensive.
