This little pool on Porthtowan beach is one of the North coast's best kept secrets. In fact I only found out about it after leafing through a best-selling book!
The tidal pool is covered at high tide - this is where the water comes from. At lower tides though it is a supposedly safe spot to splash around in without the dangers of the Atlantic ocean from which it fills. However, to get to the pool has more than a few risks; you can take the perilous 'steps' down the cliff side or clamber over the large rocks between here and the beach.
Once in the pool, I would be a little nervous about what might fall from the towering cliffs above.