The southeast side of the beach is a wide flat sea erosion cave. This sea erosion
cave which is above sea level shows that the earth's crust rose and thus made the
sea erosion cave appear on the seashore due to its lifting force. Walking toward
the south, you will see the enormous gneiss rock wall with several huge quartz seams
running through, which is a rare sight in Taiwan. On the far most southern side,
you can see several narrow and long caves which were formed by sea water eroding
the weaker parts of the cliff. One of those caves runs through the rock stratum.
If you enter this cave from the north you will need to turn sideways to enter. You
can hardly see your fingers when you go further to the midpoint of the cave where
it is spacious. The height and width of the cave differ and you need to be careful
and use your hands to feel your way forward. When a light appears ahead, you will
see the exit in front of you. The cave is worth exploring. However, you should be
very careful because of typhoons, earthquakes and the effect of sea water erosion
can change the situation in the cave at any time.
Also along the beach to the south of the trail you will find some of the largest
white quartz in this area. The large rocks on Heren Beach are good for climbing
but beginners should go with an instructor.