The Fusine Lakes (lâgs di Fusinis in Friulian, Weißenfelser Seen, in German, Belopeška jezera in Slovene) are a complex of two small lakes, the Upper Lake and the Lower Lake, located a short distance from each other in the territory of the municipality of Tarvisio (hamlet of Fusine Laghi, Friuli-Venezia Giulia) and considered among the most beautiful examples of Alpine lakes.

Of glacial origin, they are located in a limestone amphitheatre created by the Mezzodì Peak ridge of Mount Mangart. The valley, which runs parallel to the Italian-Slovenian border and not far from the Italian-Austrian border, has been a protected area since 1971 under the name of the Fusine Lakes Nature Park.

The Upper Lake is located at 929 m a.s.l., has a maximum depth of 10 m and an area of 9 ha; the Lower Lake, which is wider and deeper, is located at 924 m a.s.l., has a maximum depth of 25 m and an area of 13.5 ha. In the vicinity of the Lower Lake there are two other tiny lakes, called Small Lakes. The Upper Lake feeds the Lower Lake underground and the latter feeds the outflow of both lakes.

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