When Su Dongpo (1037-1101) arrived to the east of Hainan City, he came across a pair of wells, sited very close to one another, and having savoured their differences, named them the Paired Wells, their water flowing from the stones of a cliff. Dongpo drank their waters and was surprised by  them, saying: “I seek a white dragon but have not yet seen it; now I know that it dwells in these waters!” His travelling companion was surprised by this question, and asked about its motivation, saying: “The white dragon will emerge from among us; please wait a moment.” Presently they saw a tail like a silver serpent sprout from his back, and the water clouding as mist and vapour rolled across its surface; raising his head like the finest chopsticks [?], he swam away. Later, the prefectural commander Zhang Zixiu had a convent built atop the well, calling it Remembering Those Afar, with a pavilion named Water Drawn From Afar.
Anon., Huhai xinwen yijian xuzhi, 後2.265-66 (Tale 482):
蘇東坡至海南城東，見有雙井，相去咫尺，而味兩般，號雙井，水源出巖石中。東坡酌水異  之，曰：「吾尋白龍不見，今知居此水中乎！」同遊者怪問其故，曰：「白龍當為我出，請徐待之。」俄見其脊尾如生銀蛇，忽水渾有雲氣浮水面，舉首如插工筯，乃泳而去。後有郡守張子修為造庵井上，號思遠，亭名泂酌。
Yuan Haowen 元好問, Chang Zhenguo 常振國 (ed), Xu Yijian zhi 續夷堅志 (Continued Records of the Listener), and Anon., Jin Xin 金心 (ed.), Huhai xinwen yijian xuzhi 湖海新聞夷堅續志 (Continuation of Records of the Listener with New Items from the Lakes and Seas) (Beijing: Zhonghua shuju, 1986).