# name (topography.hyd)

The name of the topography record is a primary key referenced by [topo](https://swatplus.gitbook.io/io-docs/introduction-1/hydrologic-response-units/hru-data.hru/topo) in [**hru-data.hru**](https://swatplus.gitbook.io/io-docs/introduction-1/hydrologic-response-units/hru-data.hru) and [topo](https://swatplus.gitbook.io/io-docs/introduction-1/routing-units/untitled/topo) in [**rout\_unit.rtu**](https://swatplus.gitbook.io/io-docs/introduction-1/routing-units/untitled).