According to the local legend, a black dragon was seen in the lake and was believed by Chinese Taoists to be a god of water protection called Xuanwu which gave it its name.
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Meditation focused upon starry deities (e.g., the Santai 三台 "Three Steps" stars in Ursa Major) and warrior protectors (e.g., the Xuanwu 玄武 "Dark Warrior; Black Tortoise" Northern Sky spirit).
In the main hall, called the "Great Hall of Man and Civilizations's First Ancestor" (人文初祖大殿), stands a relief sculpture of the Yellow Emperor, as well as a niche shrine decorated with the four great spirit animals of Chinese astrology: the Azure Dragon, the White Tiger, the Vermilion Bird, and the Black Tortoise.
In the video game Command & Conquer: Red Alert 3, the Empire faction has a mobile offshore base called Black Tortoise.
He drops an item used to pop one of the Sky guardians, Genbu - the Black Tortoise / Black Warrior of the North.