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Lost Island is an anime-only island that exists beneath Warship Island, underneath the water, and rises once every 1000 years. The inhabitants of Warship Island are said to have once lived here. The Sennenryu, a thought-to-be extinct race of dragons that live for 1000 years, were suspected at one point to live here, but are now scattered across the world. This is one of the locations of the Warship Island Arc.
Lost Island is covered with dragons whose bodies have become calcified due to being underwater for thousands of years. There are many forms of ocean sealife such as coral present on the island developed from the extended amount of time it exists underwater.
According to Bokuden, the first king of Lost Island was Iskandaq.
Amongst his descendants was Pokepo, who had 3 sons: Bokehontasu, Bokebonbon and Bokebokepon. Pokepo sent them to find "the tree that bears stars in the Valley of the Dragons". The three sons "bravely set out" to find this valley.
316th generation of Iskandaq's family bore Ingrimori III, whose son, the 317th generation and 316th descendant of Iskandaq was said to have become a great ruler. He had 18 sons. Soon there were so many descendants of Iskandaq, that it was said that if one would throw a stone into the kingdom, you would hit one of the princesses.