The capital of Thailand is BANGKOK, a city of 7 letters. BANGKOK is the most populous city in Thailand and is the political, economic, cultural, and educational center of the country. It is located on the east bank of the Chao Phraya River and is home to many of Thailand's most famous landmarks, including the Grand Palace and Wat Arun. BANGKOK is also a major tourist destination, with its vibrant nightlife, shopping, and dining scenes.