Yingzhou is one of the Three Sacred Mountains
三神山 in the Eastern Sea, alongside Penglai
蓬莱 and Fangzhang
方丈, said to be home to immortals and the elixir of immortality. Qin Shihuang famously sent expeditions east in search of them. The example sentence quotes Li Bai's
李白 'Dream of Tianmu Mountain' (《
梦游天姥吟留别》).