What language to learn for Southeast Asia?

Okay, so I would really like to go to Southeast Asia one day (Philippines, Malaysia, Indonesia, Singapore, etc)
And all that jazz.
In college then what language should I learn?
Mandarin is too JUST China, right? And Tagalog is pretty much only the Philippines, and others are too country-specific (Korean, Japanese)
So whats a good language that would cover a lot of these areas. Thanks!

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