Ikiki no Gomon, Giant tree at Ōyamazumi Shrine, Imabari, Japan

Ikiki no Gomon is a camphor tree at the Okunoin of Ōyamazumi Shrine on Ōmishima, Imabari. Its four stems rise from one root mass: the main trunk measures 11 m around, the secondary 4.5 m, the total 15.5 m, with a root spread of 32 m and a height of about 10 m. The hollow at its base, roughly 2 m wide, 3 m high and 7 m long, is fitted with stone steps as the path to the Okunoin.

The tree was designated a natural monument of Ehime Prefecture on 27 November 1951, separate from the national monument covering the shrine's camphor grove. In the Meiji era it seemed to be dying, but it revived through sprouts from its rootstock; a whitened trunk and a sprout beside it were photographed in the Taishō era. Its main trunk is now largely dead and collapsing, while the secondary trunk grows vigorously.

The name Ikiki no Gomon, "gate of the living tree", comes from the hollow at its base, which serves as the approach path to Ōyamazumi Shrine's Oku-no-in. A belief in long life led worshippers to shave bark from the trunk, which weakened the tree; passing through the hollow is said to lengthen one's life. The cave was closed for a time and is open again today.

The tree stands about 150 m east of the Ōyamazumi Shrine camphor grove, behind the shrine; a sign reading "Oku-no-in · Ikiki no Gomon" marks the turn, and vehicles cannot go beyond. From the shrine it is a five-minute walk. The hollow passage, roughly 2 m wide, 3 m high and 7 m long, has stone steps and is open again after a closure.

The hollow at the base is itself the approach path to the shrine's inner sanctuary (Oku-no-in), which is why the living tree is called a gate. The cavity measures about 2 m wide, 3 m high and 7 m long, with stone steps added inside. Visitors once scraped the bark while praying for long life, which weakened the tree; passing through the hollow is still said to lengthen one's life.