יחזקאל מז:ח פירוש: רש״י

to the...frontier [Heb. הֳגְלִילָה,] la marche, frontier (province).

the eastern [Heb. הֳקֳדְוֹמנָה,] the eastern. Our Rabbis taught in the Tosefta of Succah (3:3): Where do they flow? To the Sea of Tiberias (Kinnereth), the Sea of Sodom (Dead Sea), and to the Great Sea, to heal their salty waters and to sweeten them.

[“Will descend upon the plain”] this is the Sea of Tiberias.