Fluvial morphometries as indicators were inferred from fluvial morphological features dominated by geomorphic processes. The hypsometric integral (HI), one of the fluvial morphometries, is considered to reveal fluvial evolution, types of geomorphic processes, and the tectonic characteristics of a basin. In this study, we selected the southern basins in the eastern part of the Coastal Range, characterized as having a high amount of tectonic activity, as a study area for calculating HI values of perennial rivers. Based on these values, the relation between HI values and tectonics, straths, and the areas of the river basins were determined. The results suggest that the HI values of perennial rivers are relevant to the erosive resistance of straths in the river basins rather than to the areas of the basins or recent local tectonic uplift.