Now we have selected the aquifer of our study area we can export the feature to a new layer in our GeoPackage.
1. Click right on the aquifers layer in the Layers panel and choose Export | Save Selected Features As...
2. In the Save Vector Layer as... dialogue choose GeoPackage as Format. Choose our existing GeoPackage Malawi_GIS_data.gpkg as File name. Give it the Layer name Shire Valley Alluvial Aquifer. Check that the CRS is EPSG: 32736.
3. Click OK.
The Malawi_GIS_data Shire Valley Alluvial Aquifer layer is now added to the project.
In the next subsection we'll create a buffer around the aquifer boundary to extend the study area a bit to account for boundary effects.