What is the counter for kingdoms?


I'm trying to write that a person is a citizen of two kingdoms, one earthly,
one spiritual. What is the counter for kingdom? (王国). Also, what is the best
website to find a list of counters? I've found some short lists, but I'm
looking for a comprehensive list.




Most naturally (and most commonly as well), "two kingdoms" would be
「[ふたつの王国{おうこく}](https://search.yahoo.co.jp/search?p=%E2%80%9D%E3%81%B5%E3%81%9F%E3%81%A4%E3%81%AE%E7%8E%8B%E5%9B%BD%E2%80%9D&aq=-1&oq=&ai=QPWVqZKpRJqYDQmeiYt90A&ts=18497&ei=UTF-8&fr=top_ga1_sa&x=wrt)」.

After the actual names of the two kingdoms have been mentioned, however, you
can safely use 「両王国{りょうおうこく}」. It would be highly unnatural and awkward to
keep repeating 「ふたつの王国」.

(You cannot use 「両 + Noun」 before both have been identified. You can use
「ふたつの王国」 anytime.)

