Po was the Hawaiian underworld; "sea of eternity", the placeof the 'aumakua and all the dead. It was often symbolically described asbeing toward the west or past the sunset. It was a dark sea, a land ofdarkness, the world of spirits, and a vast, fathomless sea of time.

Po wasn't envisioned as hell. It was more akin to heaven. It possessedstreams, trees, and forests, though some say that it was also an ocean.The 'Uhane experienced as much life there as they had on earth. They ate,learned new games, danced hula, played sports, conversed with their 'aumakua,and generally enjoyed themselves.

This realm was ruled by Milu, a shadowy akua which we know little abouttoday. Christian missionaries, who arrived in 1820 when traditional Hawaiianreligion was rapidly dissolving, immediately turned Po into hell and Miluinto Satan in a zealous effort to stamp out all remaining traces of traditionalHawaiian religion. This resulted in early, post-contact Hawaiian writerssuch as David Malo misrepresenting their own culture.

Milu may have at one time been a chief who, because of his disobedience to the akua, was sent by them to rule the underworld. Such stories may show Christian influence.

Another belief was that the demigod, Maui, had one day cast his lineout and hooked the island of Kaua'i with his magical fishhook and from Ka'ena Point on O'ahu, attempting topull together the two islands. He had almost brought them together whenthe fishing line broke and Kauai fell back into the sea. The only remaining piece of land from Kauai is located on the shore of O'ahu, the Pohaku O Kauai(the Rock of Kauai), which laid just offshore of Ka'ena Point until a few years ago when it broke off and fell into the sea.