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Which lands were included in the Fatimid empire at its greatest extent?

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At its greatest extent, the Fatimid empire was centered in Egypt, which served as the heart of their state after the capital was moved to Cairo.1

Beyond Egypt, the empire's provinces at their peak included:

North Africa
Sicily
Syria
Palestine
Yemen
The Hejaz, including the holy cities of Mecca and Medina
The Red Sea coast of Africa1

By controlling these regions, the Fatimids sought to establish a universal Ismāʿīlī caliphate and expand their influence through both military conquest and grand strategy aimed at dominating trade routes between Asia and the Near East.1