Death Mountain Crater

Appearing only in Ocarina of Time, Death Mountain Crater is the volcanic center of Death Mountain.

It can be accessed from the top of Death Mountain or through an ancient Goron pathway that leads from the chief's room in Goron City. The crater is the location of the Fire Temple and home to the ancient dragon Volvagia.

Features
The heat of the crater is too intense to be in for very long unless the Goron Tunic is being worn. Without this tunic, Link only has a limited amount of time to stay in the crater, otherwise he loses a heart the longer he stays without the proper equipment. The amount of time Link can remain in the crater is dependent upon how many Heart Containers Link possesses.

After Link receives the Goron Tunic from Darunia's son and enters Death Mountain Crater for the first time, Sheik will appear in front of him and teach Link the Bolero of Fire, which allows him to immediately transport back to the crater at any given time. The Bolero of Fire is needed to access the middle portion of the crater as young Link.

The Great Fairy of Wisdom also resides in the Great Fairy's Fountain on the western portion of the volcanic area, but its entrance is blocked by giant boulders that can only be removed with the Megaton Hammer. Once Link enters the fountain, he meets the Great Fairy within it who doubles his Magic Meter.

Trivia

 * Death Mountain Crater and the Volcano Summit seem to be very closely related or are possibly the same location, leading many to theorize that Eldin Volcano becomes Death Mountain in the future.
 * Both the Death Mountain Crater and Volcano Summit damage Link due to extreme heat. The only way the young hero can prevent this is by receiving an item, in this case the Goron Tunic and the Fireshield Earrings respectively.