What? : A small-sized heart-shaped lake located above Castle Lake near Mount Shasta. A short but highly rewarding 1.3 miles hike (800 feet elevation gain) climb up from Castle Lake will bring you to the high ridge with a clear view of Mt. Shasta and Castle Lake below you.
One of my most recommended hike in this area.
This location is part of my "North California Waterfall Loop" road-trip suggestion.