The Lunain (French pronunciation: [lynɛ̃]) is a 51.4 km (31.9 mi) long river in the Yonne and Seine-et-Marne departments in north-central France.

[1] Its source is in Yonne, less than 3 km (1.9 mi) south-west of Égriselles-le-Bocage.

It joins the Loing at Épisy in Seine-et-Marne.

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