Abstract
The main purpose of this study is to classify Japanese river basins based on their geographical features. The indices which indicate a shape of a river basin are selected. And new indices are proposed to express a geographic feature of a river basin better. Results of basic statistical analysis of the indices are shown. The characteristics of each index are described. Correlations between the indices are shown and main factors to classify river basins are found by factor analysis. Using these factor scores, the river basins are classified into 14 types based on their own geographical features by cluster analysis. The typical geographic models of Japanese river basins are presented.
