continental United States; mainland United States
Refers to the contiguous 48 states or the main part of the U.S., often in contrast to Hawaii, Alaska, or overseas territories.
I plan to move from Hawaii to the mainland United States.
This product has not yet been released in the continental United States.
Compound of 米 (べい, abbreviation for アメリカ) and 本土 (ほんど, mainland).