For US citizens you must have a valid passport to visit Mongolia. A visa is not required if you are visiting for fewer than 90 days; however, if you plan to stay in Mongolia for more than 30 days you must register with the Office of Immigration, Naturalization, and Foreign Citizens in Ulaanbaatar within seven days of arriving in Mongolia. If you do not register and you stay longer than 30 days, even for reasons beyond your control, you will be stopped at departure, not allowed to exit, and have to pay a fine
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