Lost Island

Lost Island is an island that is protected by a mirror-like mirage around it, caused by hot and cold water colliding, and is in the eye of a typhoon. The inhabitants of Warship Island used to live here, and as a result there are many ancient ruins. 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. It first appeared in episode 57.

History
According to the grandfather of Apis, 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 familly 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 princes.