The Tanzania eVisa permits a single stay of up to 30 days in Tanzania for most nations. However, if you are a US citizen, you enjoy multiple entries for up to 90 days.
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All visitors are required to obtain an e-visa before departing for Kenya. If you require a multiple-entry visa, be sure to apply well in advance of travel. Required for Entry: Passport with at least two blank pages, six months' validity, and a Kenyan e-visa.