Which of these Asian countries consists of only one city?

Singapore is a city-state located at the southern tip of the Malay Peninsula, about 85 miles north of the Equator. It consists of the diamond-shaped Singapore Island and some 60 small islets; the main island occupies all but about 18 square miles of this combined area. It owes its growth and prosperity to its focal position at the southern extremity of the Malay Peninsula, where it dominates the Strait of Malacca, which connects the Indian Ocean to the South China Sea.

Source: Britannica