Penglai in Shandong lies on the sea, and in summer people on the shore often see mirages out at sea.
Tips
culture
蓬莱, 方丈 and 瀛洲 were the three sacred islands of the immortals; 秦始皇 sent 徐福 to sea to find them. The Shandong coast took the name, and the Eight Immortals of 八仙过海 are said to have set off from there.
usage
蓬莱仙境, "the fairyland of Penglai", is used for any place of unearthly beauty.