If you were to go somewhere on the African continent, where would be the most hygienic and safe?
Literal
Africa continent [possessive-の] somewhere [to-へ] go [conditional-としたら] where [subject-が] most hygienic [and-で] safe [question-ですか]?
~としたら 'if one were to' — a hypothetical conditional. 衛生的 'hygienic' — ~的 suffix. The question is practical travel-planning, though the framing implicitly acknowledges concerns about health and safety in Africa.