Fan Zhongyan writes 'at Dongting, one lake,' locking the gaze onto that one expanse of water.
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From 《岳阳楼记》 by 范仲淹 (Fan Zhongyan, Northern Song, 1046): '予观夫巴陵胜状,在洞庭一湖。' The essay's famous line 'worry before the world worries, enjoy after the world enjoys' (先天下之忧而忧,后天下之乐而乐) comes later in the same piece.
usage
洞庭 = Dongting Lake in northern Hunan — historically China's largest freshwater lake before the Yangtze silted parts of it.