Do we know what Eretz Yisrael is supposed to be, as defined by Hashem in our Torah? If you look at the book of Numbers, at verses 34:2-12, you will find the exact borders (south, north, east and west) defining our Holy Land. Here are a few resources to help you chart out the actual ancient borders of our holy land that are still respected by our Gedolim today.
To help you visualize the borders with flashcards try these items from TorahFlashcards.com.
A very good but hard-to-find book with beautiful maps and information is Eleh Mas’ei, also the name of a torah portion, written by Dan Schwartz.