<![CDATA[River basins play an important role in maintaining ecosystem balance and water resource availability. The Cirasea sub-basin in the Citarum Hulu region is experiencing ecological pressure due to land use change, erosion, and sedimentation. This study aims to compare the use of DEMNAS and DEM SRTM data and identify the morphometric characteristics of the Cirasea sub-watershed using remote sensing and Geographic Information System (GIS) approaches with National Digital Elevation Model (DEMNAS) and Shuttle Radar Topography Mission (SRTM) data. The analysis includes watershed boundary delineation, measurement of area, length, width, river gradient, river order, stream network density, watershed shape, and slope inclination using ArcGIS 10.8 software. The results show that DEMNAS is superior in displaying topographic details and stream networks compared to SRTM, which tends to simplify drainage patterns. The difference in resolution has implications for the accuracy of identifying morphometric parameters, particularly for tributaries, slope distribution, and stream density. These findings emphasize the importance of utilizing high-resolution data for watershed analysis in national priority areas and can serve as a basis for conservation planning, hydrometeorological disaster mitigation, and sustainable watershed management.]]>
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