Ao Chau Lagoon is one of the notable natural attractions of Phu Tho, set amid the rolling hills of the midland region. Its broad expanse of water is dotted with more than 100 small islands and peninsulas covered in diverse vegetation. Narrow inlets wind between the hills, creating a distinctive landscape of green slopes reflected in calm waters. This combination of islands, waterways and forested surroundings has earned the lagoon its popular comparison with Ha Long Bay.

The lagoon provides opportunities to explore the scenery by boat, enjoy fishing and relax in a quiet natural setting. The surrounding area features tea hills, fruit gardens and rural communities that add to its appeal as an ecotourism destination. For visitors exploring Phu Tho beyond its historical and spiritual landmarks, Ao Chau Lagoon offers a different experience centered on nature, peaceful waterways and the landscapes of northern Vietnam’s midlands.