Balfour Lake was a lake on an unnamed planet.

Jack and Beverly Crusher brought their son, Wesley, here on his first camping trip sometime between 2349 and 2353. Wesley amused himself by throwing manta leaves into a fire to watch them pop. Beverly was reminded of this trip in 2370 while stranded on planet Kesprytt III. (TNG: "Attached")

The location of Balfour Lake was not given in the episode, though there are several lakes with that name throughout North America. It is also possible that the lake was on another planet, such as Beverly's homeworld of Caldos.
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