3 sentences

1. 传说东海龙王居住在海底的水晶宫中。

   chuán​shuō Dōng Hǎi Lóng​wáng jū​zhù zài hǎi​dǐ de Shuǐ​jīng​gōng zhōng.

   Legend has it that the Dragon King of the East Sea lives in a crystal palace at the bottom of the sea.

   Source: Dong Chinese Dictionary

2. 古书中记载，东海之上有一处仙境名为蓬莱。

   gǔ​shū zhōng jì​zǎi, Dōng Hǎi zhī​shàng yǒu yī chù xiān​jìng míng​wéi Péng​lái.

   Ancient books record that there is a fairyland named Penglai on the East Sea.

   Source: Dong Chinese Dictionary

3. 舟山群岛位于中国东海。

   Zhōu​shān qún​dǎo wèi​yú Zhōng​guó Dōng Hǎi.

   The Zhoushan Archipelago is located in the East China Sea.

   Source: Dong Chinese Dictionary