Lower Navarre (, Gascon/Bearnese: Navarra Baisha, , ) is a traditional region of the present day Pyrénées Atlantiques département of France. It corresponds to the northernmost merindad of the Kingdom of Navarre during the Middle Ages. After the Spanish conquest of Iberian Navarre (1512–24), this merindad was restored to the rule of the native king, Henry II. Its capitals were Saint-Jean-Pied-de-Port and Saint-Palais. In the extreme north there was the little sovereign Principality of Bidache. Its extent is of 1,284 km², and has a decreasing population of 44,450 (in 1901), 25,356 (in 1990).