You can use the data in this repository to create an example reverse geocoder, as explained in the tutorial chapter of the OpenCage guide to reverse geocoding.
The repo includes a single GeoJSON file with four ocean shapes.
Load it into Postgres with the following command:
ogr2ogr -f "PostgreSQL" PG:"dbname=oceans_db user=postgres" "oceans.geojson" -nln oceans
(Where your database is oceans_db and the table is oceans)
If you want to append it to existing data, use the -append flag
Alternatively, you can load many GeoJSON files in the same directory with the import-geojson.py script, passing the directory as a command line parameter.
We run the OpenCage Geocoder. Learn more about us.
We also run Geomob, a series of regular meetups for location based service creators, where we do our best to highlight geoinnovation. If you like geo stuff, you will probably enjoy the Geomob podcast.