The 16 regions of Ghana as GeoJSON or CSV, free to download and use with credit. Each region comes with its area and centre point.
The outlines are from geoBoundaries, simplified to about 200 metres so the whole country is around 110 KB: light enough for a web map, detailed enough for a dashboard. They are published under CC BY 4.0, so credit geoBoundaries when you use them.
The GeoJSON is a FeatureCollection of MultiPolygons in longitude and latitude (WGS 84), with each region's name, area in square kilometres and centre. The CSV carries the same outlines as WKT.
The district outlines, and every dataset in the catalogue tagged to its region and district, are available with an API key.
Sources: geoBoundaries
GET https://connect.apighana.com/api/tools/boundaries/regions.geojson