When referring to locations beyond one's native country, the phrase "most oversea" can be replaced by a variety of synonyms. Some of these include "foreign," "international," "abroad," "overseas," and "transnational." Each of these words conveys the idea of being in a place outside of one's usual surroundings. Additionally, words such as "exotic," "far-flung," and "distant" can be used to describe a location that is particularly far away or culturally different from what one is accustomed to. Ultimately, the choice of synonym will depend on the context of the sentence and the specific connotations that the writer wishes to convey.