The UAE territory separating Ru'us al Jibal from the rest of Oman extends almost as far south as the coastal town of Shinas. A narrow, well-populated coastal plain known as Al-Batinah runs from the point at which the sultanate is re-entered to the town of As-Sib, about to the southeast. Across the plains, a number of wadis, heavily populated in their upper courses, descend from the Western Hajar Mountains to the south. A ribbon of oases, watered by wells and underground channels (aflaj), extends the length of the plain, about inland.