Short answer
Families should consider language, culture, travel, residence, family responsibilities and expectations before agreeing to the marriage.
Islamic Guidance
What Islam teaches
Islam does not make state or regional boundaries a requirement for marriage.
Practical Guidance
What you can consider
Discuss where the couple will live, how often families will meet and how cultural differences will be handled.
Sources
Qur'an 49:13; Qur'an 30:21.