 On 7 October 2006, Ngerulmud replaced Koror as Palau's capital city.The first sighting of Koror, Babeldaob, and Peleliu recorded by Westerners was by the Spanish expedition of Ruy López de Villalobos at the end of January, 1543.They were then charted as "Los Arrecifes" (The Reefs in Spanish).