Chris Davies says:
This has to be one of the more spectacular areas to boulder in Wales; Very beautiful and if your after a bit of solitude, this is the place.
There are around 20 problems in and around the initial lake/bothy area, but if you walk for another 10 minutes to the back of the Cwm on the left saddle, there are more boulders, which are also very nice! Grades from Easy to around 7b+, although maybe one or two slightly trickier.
Video 4 mins 50 secs.