Greater Israel occasionally refers to the Promised Land (defined in Genesis 15:18-21) or to the Land of Israel, and is also called Complete Land of Israel or "Entire Land of Israel" (Hebrew:‎, Eretz Yisrael Hashlemah). This is a more accurate translation than "Greater" Israel, which is used in English but has no real counterpart in Hebrew.
The Bible contains three geographical definitions of the Land of Israel. The first, found in Genesis 15:18-21, seems to define the land that was given to all of the children of Abraham, including Ishmael, Zimran, Jokshan, Midian, etc. It describes a large territory, "from the brook of Egypt to the Euphrates", comprising all of modern-day Israel, the Palestinian Territories, Lebanon, Syria, Jordan, and Iraq, as well as Kuwait, Saudi Arabia, U.A.E, Oman, Yemen, most of Turkey, and all the land east of the Nile river.
The other definitions are found in Deuteronomy 11:24, Deuteronomy 1:7, Numbers 34:1-15, and Ezekiel 47:13-20. They describe smaller territories (see the map included in this article). The definition in Numbers and Ezekiel refers to the land that was divided between the original twelve tribes of Israel after they were delivered from Egypt, and finally, the borders defined in the book of Deuteronomy are those that will be given to the children of Israel slowly throughout the years (please see Exodus 23:29 & Deuteronomy 7:22).
[link to en.wikipedia.org