Aragorn and the others must defend Gondor from assault by Sauron's forces while Sam & Frodo sneak across Mordor to Mount Doom.
See also: The Fellowship of the Ring & The Two Towers.
Smeagol and Deagol are fishing in the Anduin when Deagol finds The Ring and then Smeagol steals it.
Source: Location Guidebook
Frodo and Sam rest before traveling into Mordor at the start of the film. Exact location near Ohakune is unknown.
Source: Appendices - New Zealand as Middle-earth
This valley was heavily digitally altered and used as the basis of Isengard.
The armies of Rohan return to the capital, where Aragorn tries to convince them to ride to the aid of Gondor.
Arwen is traveling to the Grey Havens when she has a vision of her future son with Aragorn. Exact location of filming is unknown.
Source: DVD Commentary - Production
Gandalf and Pippin ride over a hill and approach Minas Tirith after leaving Rohan.
Aragorn, Gimli, and Legolas emerge from the Paths of the Dead.
The forces of Mordor lay siege to the Gondor city of Minas Tirith. The set was constructed over the remains of the Helm's Deep set.
Sam, Frodo, and Gollum come upon a statue of a king that has been vandalized by orcs. Exact location is unknown.
One of the beacons leading from Minas Tirith to Edoras is lit along this mountain range. This was the only real beacon, the rest were computer generated. Location is approximate.
Source: New Zealand Department of Conservation
The armies of Rohan and Gondor battle against those of Mordor outside the gates of Minas Tirith.
The Rohirrim gather at the Dunharrow and get ready to ride to Gondor's aid.
High camp at Dunharrow where the Rohirrim gather before riding to Gondor.
Aragorn goes into Theoden's tent to meet with Elrond in the upper Dunharrow campsite.
Valley that leads to the caverns beneath Dwinmorberg that Aragorn, Legolas, and Gimli walk down to meet the Army of the Dead.
Close up shots of the battle of Pelennor Fields were shot here, but most of it was in front of a blue screen and is unrecognizable.
The armies of Gondor and Rohan stage a last stand against the forces of Mordor to buy some time for Frodo. Filmed in an military live fire area and probably should not be visited.
Source: DVD Appendices
Location on Mount Doom where Frodo collapses under the eye of Sauron.
Frodo & Sam climb up the slopes of Mount Doom.
At the end of the film, the Hobbits return to Hobbiton and live out their days.