Located 8 km from Quy Nhon city to the northeast, Thi Nai Lagoon is the largest lagoon in Binh Dinh province. It has a rich ecosystem with many precious plants and animals and beautiful landscapes. Thi Nai Lagoon covers an area of over 5,000ha of water surface, more than 10km, width to nearly 4km. It is a place where natural resources are gifted, and is a place of biodiversity with rich mangrove ecosystems, including: 25 species in seagrass area; 64 species of phytoplankton and 76 species of fish; hundreds of species of birds, of which 23 species are of waterfowl and migratory birds while 10 species are of forest birds etc... In the lagoon, near the western bank is a small shrine set up by fishermen to worship the Sea God. This shrine is shaped as an ancient tower, called Thầy Bói Tower, making the overall scenery to be more vidid and attractive. Here in this place, you can enjoy the dawns or mystical dreamy full moon nights inside the mangrove forest.
To the east of Thi Nai lagoon is Phuong Mai Peninsula, which stands as a giant wall guarding the sea side of Quy Nhon. The peninsula has a rock mountain system and giant sand dunes, expanding 15km towards the sea. North of the peninsula are the beautiful beachese stretching dozens of kilometers coastline. As seen from afar, Phuong Mai peninsula resembles a dragon head whose body stretches to the far north of De Gi. In the south end of the peninsula is a sharp dangerous rock mountains where swallow birds come build their nests, extremely nutritious gifts given to the people.
Blending in the natural beauty of Thi Nai lagoon, Phuong Mai Peninsula, is the bridges of Quy Nhon - Nhon Hoi with a total length of over 7km, including 5 short bridges and Thi Nai Bridge. Of these bridges, Thi Nai Bridge stands out as one of the bridges longest cross- sea of Vietnam of 2,477.3 meter long with 54 spans connecting Quy Nhon city and Nhon Hoi economic zone. This bridge is not only the pride local people, but also an attractive destination to tourists.