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Vientiane is the capital city of Laos, located along the Mekong River and serving as the political, cultural, and economic center of the country. It is known for its French colonial architecture, historical temples, and vibrant street life.

The other cities listed are capitals of different countries in Southeast Asia; Phnom Penh is the capital of Cambodia, Bangkok is the capital of Thailand, and Hanoi is the capital of Vietnam. This distinction highlights the geographic and political diversity of the region, emphasizing that each of these cities plays a significant role in its respective country, while Vientiane specifically identifies the capital of Laos.