This dataset is a vectorized version of the Nested Catchments dataset with a minimum area threshold of 50 square kilometres created by the Centre for Resource and Environmental Studies. The Nested Catchments grid dataset was available as a public download via the National Land and Water Resources Audit (NLWRA) website, and has been vectorized by staff within the Environmental Resources Information Network (ERIN) within the department.Under contract to the National Land and Water Resources Audit, the Centre for Resource and Environmental Studies at the Australian National University created a nested series of drainage basins, catchments and sub-catchments from version 2 of the 9 second digital elevation model of Australia. This dataset shows as a polygon coverage the nested catchments data with a minimum area threshold of 50 square kilometres.The revised version 2 DEM overcomes significant deficiencies in the drainage structure of the first DEM. When amalgamated, the new catchments show close but not complete agreement with the Australia's River Basins data from AUSLIG 1997. There are discrepancies in the Western Drainage Division. There are also some minor discrepancies in some catchment boundaries.NOTE: This item refers to a dataset available under a Departmental Deed. The related metadata is available for download as a Word document as necessary. Additional information about this dataset or requests for access to the data should be directed to geospatial@dcceew.gov.au