The beach is entirely artificial, with sand imported to create a recreational space in a region otherwise dominated by rocky, inaccessible cliffs.
It sits on a geological fault line characteristic of the Cat Ba archipelago, which creates the unique bay-like curvature of the coastline.
The water clarity is generally higher here than at Cat Co beaches due to its distance from the main port's boat traffic.
The limestone outcrops surrounding the beach belong to the same UNESCO World Heritage-listed geological system as Ha Long Bay.
Tung Thu Beach is the most developed artificial beach on Cat Ba Island, characterized by its man-made sandy shoreline and calm, sheltered bay waters. Located within a small cove, the beach is protected from strong currents and high waves by surrounding limestone karsts. It features a dedicated swimming area marked by buoys and a flat, sandy bed that transitions gradually into deeper water. Unlike the smaller Cat Co beaches, Tung Thu offers a more expansive stretch of sand, though it remains significantly quieter than the main town centers. The facility includes basic amenities such as showers, toilets, and on-site dining options. While the beach is man-made, it integrates with the natural karst landscape of Lan Ha Bay. Access is facilitated by a paved path directly from the main road connecting the town center to the northern part of the island.
The northern rocky cliff path overlooking the entire arc of the beach provides the best panoramic perspective.
Bring water shoes, as the seabed can have occasional rocky patches or coral debris beyond the artificial sand zone.
Visit during the shoulder season (September or late April) to avoid the peak domestic tourist crowds of July and August.
Bring your own towels and beach gear, as rental options can be limited or unavailable during weekdays.
Do not swim outside the marked buoy area as the currents near the karst openings can be unpredictable.
Best experienced from April to October; swimming may be restricted during winter months due to low temperatures.
Standard beach modest swimwear is recommended; avoid topless sunbathing.
