トピ主さんが中国国籍をお持ちでしたら、香港or北京を選ぶことが可能ですけど
でも日本国籍ですよね?なら無理ですよ〜。
Sponsorship of a spouse, common-law partner, conjugal partner or dependent child living outside Canada
http://www.cic.gc.ca/english/information/applications/guides/3999Etoc.asp
Question 4 Immigration Office requested for the processing of your application
のところに次のように記載されています。
Indicate the name of the Immigration Office which serves:
your country of nationality, or
the country in which you are residing, provided that you have been lawfully admitted to that country for at least one (1) year.
トピ主さんは現在何のビザでカナダ滞在中でしょうか?
例えば就労ビザをお持ちで1年以上カナダに滞在できる等でなければ
日本国籍の場合だと、マニラ一択になりますね。