This is the part of the Alentejo region located to the north of the River Tagus. In mediaeval times, the area was defended by Belver Castle. These were the Lands of Guidintesta, given over to the Order of the Hospital, which built a replica of Jerusalem’s Belvoir Fortress here. The river marks a trail through nature teeming with life; here, too, are megalithic remains, historical defensive structures, ancient but now submerged river and sulphurous spas, and a huge, dammed reflecting pool, bounded by a romantic walkway.