Africa/Nouakchott is a timezone and its consensus geometry is derived from woedb.
{"mz:is_ceased":0,"geom:latitude":20.265193,"wof:name":"Africa/Nouakchott","counts:names_total":1,"wof:placetype":"timezone","gp:source":"geoplanet 7.6.0","mz:is_current":-1,"wof:hierarchy":[{"continent_id":102191573,"country_id":85632679,"timezone_id":102048139}],"mz:is_deprecated":0,"lbl:latitude":19.574507,"geom:area":90.103694,"geom:longitude":-10.334445,"wof:id":102048139,"counts:concordances_total":1,"geom:type":"MultiPolygon","wof:lastmodified":1566655484,"wof:fullname":"Africa/Nouakchott","wof:belongsto":[102191573,85632679],"wof:concordances":{"gp:id":28350724},"mps:latitude":19.574507,"wof:repo":"whosonfirst-data-admin-xy","wof:lang":["eng"],"src:geom":"woedb","wof:country":"","counts:names_preferred":1,"src:geom_alt":[],"geom:area_square_m":1.0437835899067686E12,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"","counts:names_languages":1,"geom:bbox":"-17.066521,14.715547,-4.827674,27.298073","name:eng_x_preferred":["Africa/Nouakchott"],"mps:longitude":-9.729937,"src:lbl_centroid":"mapshaper","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-9.729937,"wof:geomhash":"f2426f65cf1c3ca8e6dc1a805f5fdeaf","wof:parent_id":85632679,"wof:placetype_names":["timezone"],"mz:hierarchy_label":1,"wof:placetype_id":136057795,"edtf:cessation":"uuuu"}