The Buddhist Amarapura Nikaya sect had its first upasampada (higher ordination ceremony) on a fleet of boats anchored upon it in 1803.
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The Maduganga river is a shallow water body in south-west Sri Lanka, which enters the sea at Balapitiya.
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Soon after their return to the island they established a udakhupkhepa sima (a flotilla of boats moved together to form a platform on the water) on the Maduganga river, Balapitiya and, under the most senior Burmese monk who accompanied them, held an upasampada ceremony on Vesak Full Moon Day.