how should I address?

Overseas expereince is nice to have but may not necessarily be a showstopper if you dont have one.

What does an overseas experience provide more than working at your home ground?
I can think of two imp things
1) multicultural experience, ability to work with culturally diverse teams
2) Client facing roles (if on work)

1) Overseas experiences is a general term and yes a 6 week stay ( a part of a student exchange program perhaps ) can be a good learning exp and a good point to mention about.
2) Yes could talk of going overseas to Visit relatives and perhaps to enhance your hobbies (say photography of tourist attractions, meeting people of different cultures)

To defend lack of professional experience overseas

If you work in an organisation which intakes international candidates you can say you have worked effectively in a multicultural environment to compensate for lack of professional overseas travel.