The Nepean River is a significant freshwater fishery located in New South Wales, Australia, with its headwaters forming approximately 100 kilometres south of Sydney. The river flows northward through remote water catchment areas before entering Nepean Dam, which serves as a major water supply for Sydney. North of the dam, the river traces the western edge of Sydney's metropolitan area, passing through the towns of Camden, Wallacia, and Penrith. Several tributaries feed into the Nepean along its course, including the Warragamba River, Glenbrook Creek, and the Grose River, after which the Nepean transitions into the Hawkesbury River. The river is renowned for its dramatic Nepean Gorge section, where sheer sandstone walls rise above clear, clean water shaded by large eucalyptus trees — a setting that makes it one of the most scenic freshwater fishing destinations near Sydney.