Known in legend as the Dragon's Nest, Lost Island is an anime-original landmass said to sit submerged below Warship Island. Surfacing only after a thousand-year wait, it once sheltered the ancestors of Warship Island's people and was tied to the long-lived Sennenryu dragons.
Lost Island, also titled the Dragon's Nest, rests under the waters beneath Warship Island and is described as breaking the surface only once across a span of one thousand years. Its terrain is blanketed by dragons whose forms have calcified after spending ages submerged. Because it has spent so long beneath the sea, an abundance of marine growth such as coral has spread across it.
Accounts of what Lost Island actually is do not fully agree. Treated as the original homeland of Warship Island's residents, it is placed within a concealing mirage and a storm. Read instead as nothing more than the breeding grounds of the Sennenryu, it becomes the underwater stretch of land ringing Warship Island. That dragon race, long presumed gone and credited with thousand-year lifespans, was once believed to dwell there before scattering across the globe.
By Bokuden's telling, the earliest ruler was King Iscardunk Pokeportes, whose trio of sons, Bokehontas, Bokebonboko, and Bokebokepon, were sent off to track down a star-bearing tree growing within the Dragons' Valley. Many generations onward, the 317th ruler Ingrimongri III fathered Ingrigrimori, remembered as a great sovereign with eighteen sons. A later descendant, King Ikemenes, pushed through numerous reforms and had sixty-five sons, so plentiful that a stone tossed into the realm was joked to strike a prince.
Hokehontas held the throne as the 1,121st king. Afterward came King Nemenememitas, who during his reign worked out and put into place a defense meant to shield the kingdom should a larger nation strike. The royal line is recorded as lasting to at least its 1,201st monarch. A printed retelling connected to the Warship Island storyline carries Bokuden's account further still, all the way to the 1,312th king.

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Yes, Lost Island is a non-canon, anime-only landmass that appears solely in the anime as part of the Warship Island storyline and has no basis in the original manga.
Lost Island, also called the Dragon's Nest, is an anime-original landmass said to rest submerged beneath Warship Island and surface only once every thousand years. Legend ties it to the Sennenryu dragons and treats it as the original homeland of Warship Island's people.
Lost Island is linked to the Sennenryu, a race of dragons believed extinct and credited with thousand-year lifespans, who were once thought to have dwelled there as their breeding grounds before scattering across the world.
Bokuden's chronicle traces Lost Island's rulers from the earliest king, Iscardunk Pokeportes, through generations including Ingrimongri III, Ikemenes, Hokehontas, and King Nemenememitas, with the royal line recorded as continuing to at least its 1,201st monarch.
During his reign, King Nemenememitas worked out and put into place a defense meant to shield the kingdom of Lost Island should a larger nation ever attack.
Looking for more on Lost Island? The One Piece Wiki on Fandom has a dedicated page with community notes.
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