Aerial bird's eye view of Angel Billabong on Nusa Penida island, a tidal infinity rock pool amid naturally formed patterns and texture of jagged formations

angels billabong nusa penida rock pool tidal pool natural infinity pool aerial birds eye rough sea waves pounding ocean tide people tourists rock formation texture pattern naturally formed clastic limestone dolly bali island angel billabong sakti oxbow emerald white water foam flow hydraulic abrasion coastal erosion crystal clear jagged seascape establishing edge drone powerful waves battering geological formation geotourism unique