Back east we go, tracing the uncertain outlines of עבר הירדן המזרחי. With love, clarity, and a dash of cartographic chaos, Rav Shlomo Katz explores what happens when the Torah says “from the desert to the river” but leaves the rest to us. Through Rambam’s squared geometry, the conquest of Sichon and Og, and the promise of נהר פרת, we touch the dream of the future borders of ארץ ישראל—stretching into lands yet to be revealed.