This information was revealed through the semi-canonical Lost video game
Lost: Via Domus
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Characters:   Beady Eyes · Elliott Maslow · Lisa Gellhorn · Zoran Savo · Rico
Episodes: "Force Majeure" · "A New Day" · "Via Domus" · "Forty-Two" · "Hotel Persephone" · "Whatever It Takes" · "Worth A Thousand Words"

A lake was discovered by Elliott Maslow in "Whatever It Takes". The Lake is located next to the sonar fence and near the Barracks and the Flame. The Lake seems to be completely surrounded by a cliffside and forrested area, but there may be streams or rivers emitting from it.

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