There had long been a local legend among the fisherfolk of the existence of several rock carvings on Po Toi. Finally, groups of carvings were found at the southern part of Po Toi in the 1960's. They are of different motifs and separated by a rock fracture 70cm wide. One group on the left consists of lines resembling stylized animal and fish patterns, while the other on the right is composed of spirals in an inter-locking arrangement.
Rock Carvings on Po Toi were declared monuments in 1979.