The palantíri are stones who allow their users seeing distant things. There are seven palantíri:
The chief palantír is the one of Osgiliath. The palantír of Amon Súl is the chief Palantír of the North. The Palantíri of Minas Anor Minas Ithil are ´twinned´ and the palantír of Emyn Beraid looks only to the see. So the only ´plain´palantíri are those of Orthanc and Annúminás.
The palantír of Orthanc is held in Isnegard in Enedwaith