“The dove came back to him toward evening, and there in its bill was a plucked-off olive leaf. Then Noah knew that the waters had decreased on the earth.” – Genesis 8:11, JPSN
According to Genesis Rabbah, the olive leaf that the dove brought to Noah was plucked from a tree on the Mount of Olives, inasmuch that “the land of Israel was not inundated by the Flood” (Ramban, Genesis 8:11, sefaria.org), based on the verse, “a land not rained upon in the day of indignation” (Ezekiel 22:24). This implies a parallel between the judgment that fell upon the earth in Noah’s time, and that of the future, although not in the form of an actual flood, as promised through the sign of the rainbow.
Another view contends that “The gates of the garden of Eden were opened for the dove and from there she brought the leaf” (ibid.). This can be construed as an allusion to Gan Eden in Heaven, implying a connection to the peace of renewal bestowed upon the world, after the flood, as compared to the peace of restoration brought with the promise of chayei olam (eternal life) for the righteous, after the Geulah (Redemption) and Tehillas haMeisim (Resurrection of the Dead).
After the flood, the Ark rested upon Mt. Ararat, the highest mountain in the world at that time. In the future, after the flood of opposing voices to G-d that will carry many astray, the prophet Isaiah writes of those who remain true to H’Shem, “Even them will I bring to My holy mountain, and make them joyful in My house of prayer; their burnt-offerings and their sacrifices shall be acceptable upon Mine altar; for My house shall be called a house of prayer for all peoples” (Isaiah 56:7, JPS 1917 Tanach).