Study region: This study focuses on three data-limited inland river basins in the arid Hexi Corridor. Northwest China. Study focus: The lack of ground-based observation data for estimating potential evapotranspiration (PET) usually limits the streamflow simulation. This study explored the feasibility of using three gridded PET datasets (GLDAS. https://thebrickes.shop/product-category/vacuum-sealer-bags/