Land in which of these modern-day countries was never conquered by Alexander the Great?

The land that is now known as Spain was never conquered by Alexander the Great during his military campaigns. Alexander’s conquests primarily encompassed regions in the eastern Mediterranean, the Middle East, and parts of South Asia. He notably invaded and established control over Egypt, which became a significant part of his empire, and crossed into areas of modern Turkey, particularly through his campaigns against the Persian Empire. Similarly, he fought in areas that are part of present-day Afghanistan as part of his journey further east.

In contrast, Spain was not on Alexander's campaign route; it lies to the far northwest of his conquests and was not part of his realm. Therefore, identifying Spain as the region never conquered by him is accurate and demonstrates an understanding of the geographic extent of Alexander's empire.