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Sai Van Lake (Chinese: 西灣湖; Portuguese: Lago Sai Van) is a man-made lake in Sé, Macau. It is one of two man made lakes in Macau. It is located at the southern tip of Macau Peninsula.
The lake was once a bay and closed off by infill. Sai Van means West Bay. Sai Van Lake is separated with Nam Van Lake by Avenida Dr Stanley Ho.