What present-day countries mark the eastern and western boundaries of the Islamic empire?

The present-day countries of Uzbekistan and Morocco mark the eastern and western boundaries of the Islamic empire respectively.

Explanation:

The Islamic Empire is recognized as the largest empire in the history of the world. The entire Islamic empire accepted the supremacy of the Caliph and thus, the empire is also called the 'Caliphate'. All the countries from the Middle East and some countries from present-day Asia were once a part of the Caliphate. It is because of the long-lasting impact of the Caliphate that is there on most countries that were once a part of the Islamic Empire, they have declared themselves as Islamic nations.