DCAT 1.1 has these usage notes for dct:spatial:
The MDR Name Authority Lists must be used for continents, countries and places that are in those lists; if a particular location is not in one of the mentioned Named Authority Lists, Geonames URIs must be used.
An these are the DCAT 1.1 usage notes for dct:Location
A spatial region or named place. It can be represented using a controlled vocabulary or with geographic coordinates. In the latter case, the use of the Core Location Vocabulary is recommended, following the approach described in the GeoDCAT-AP specification.
That seems to be a contradiction within DCAT-AP 1.1: If either MDR or Geonames URIs must be used then CLV URIs seem to be excluded...
This also seems to be in contradiction with GeoDCAT 1.0 in section "Geographic bounding box - *Geographic location of the dataset".