Explore a unique coastal ecosystem and witness colourful coral without needing to dive at Hon Yen (Yen Island), a fascinating hidden gem located off the coast of Phu Yen, north of Tuy Hoa. This small island cluster is particularly special because, during periods of very low tide (check tide charts carefully, often during specific lunar phases around mid-month), the surrounding shallow waters recede enough to expose vibrant coral reefs, allowing visitors to walk nearby and observe them up close.  

Reaching Hon Yen typically involves a short boat trip arranged with local fishermen from nearby Nhon Hoi village, or sometimes, during extreme low spring tides, it's even possible to wade or walk across a temporary sandbar from the mainland. The main draw is observing the diverse shapes and colours of the exposed coral gardens and the small marine creatures inhabiting them – a rare opportunity usually requiring snorkeling or diving gear. Remember to walk carefully and avoid stepping on or damaging the fragile coral.

Visiting Hon Yen requires careful planning around the tide schedules to experience the coral viewing; at high tide, it appears as a cluster of small, scenic rocky islands. Even outside the lowest tides, the area offers clear waters for swimming and snorkeling (bring your own gear or arrange beforehand). For nature lovers seeking a unique coastal phenomenon and a glimpse into Phu Yen's marine biodiversity, timing a visit to Hon Yen during the right tidal conditions offers an unforgettable hidden gem experience.