Read the passage carefully and answer the questions below. The ancient town of Hoi An lies on the Thu Bon River, 30 km south of Da Nang. It was formerly a major trading center in Southeast Asia between the 16th and 17th centuries. Hoi An is famous for its old temples, pagodas, small tile-roofed houses and narrow streets. All the houses were made of wood and their pillars were carved with ornamental design. All visitors to Hoi An are commended a visit to the Assembly Hall of Cantonese Chinese Congregation. This house was built in 1855 and still keeps many precious objects that belonged to the Chinese community of Hoi An. Another attractive address to tourists is Tan Ky House, which was conducted nearly two centuries ago as house of a Vietnamese merchant. The house now looks almost exactly as it did in the early 19th century. In recent years, Hoi An has become a popular tourist destination in Viet Nam. In 1999, it was certified by UNESCO as a World Cultural Heritage Site.

1. Where is the ancient town of Hoi An?