This library implements parsers for .wkt files, based on the specification at https://www.ogc.org/standard/sfa/. For lack of clarity, some geometries (triangles/TIN/polyhedralSurfaces) aren't completely implemented yet.
Data.WTK.IO exports two key methods, readWKTFile and writeWKTFile. When read, a .wkt file will be interpreted into a Geometries object. You can manipulate it at will, and then use writeWKTFile to write the .wkt file for the new Geometries.
Individual types such as Point, LineString, Polygon, etc. also have their own individual parsers, serializers (fromWKT) and deserializers (toWKT).
Geometries are always read with Double as its base type for simplicity, but can be changed through fmaping.