The city of Sitges has been designated to host the FIDE World Women’s Team Championship 2021, to be held from September 26 to October 3. This coastal town in Spain's Catalonia region, southwest of Barcelona, has earned its place in the chess calendar, having host already held 8 editions of an important chess open, "Sunway Chess". Now, for the first time, Sitges will organize an official FIDE event.

Twelve participating teams of the Event shall be determined according to the following criteria: 

a) Best team by rating from each of the four Continents (Africa, Americas, Asia, Europe): federations with the highest average rating of the best four female players in the FIDE Rapid June 2021 Rating List from each Continent. If two or more federations of the same Continent have equal average ratings, the rating of the fifth best player of each federation shall be taken into account. If the average ratings are still equal, the rating of the sixth player shall be taken into account etc. 

b) Five teams representing federations with the highest average ratings of the best four female players in the FIDE Rapid June 2021 Rating List, not qualified by path 2.1.a. If two or more federations have qual average ratings, rating of the fifth best player of each federation shall be taken into account. If the average ratings are still equal, the rating of the sixth player shall be taken into account etc. 

c) HF team. If this team is qualified by path 2.1.a or 2.1.b, the qualification spot goes to the next non-qualified team by rating as described in Article 2.1.b. 

d) Two teams nominated by the FIDE President.

You can read the whole regulations on the FIDE handbook:

https://handbook.fide.com/files/handbook/WWTCregulations2021.pdf