The Records of the Western Regions, also known by its Chinese name as the Datang Xiyuji or Da Tang Xiyu Ji and by various other translations and Romanized transcriptions, is a narrative of the Chinese Buddhist monk Xuanzang's nineteen-year journey from Tang China through the Western Regions to medieval India and back during the mid-7th century CE.

The text presents an account of Xuanzang's route with religious details as well as reports of the people and places he encountered.

While he was not legally authorized by the Tang court to leave China, he managed to journey to India and record his meetings with the kings of various Indian kingdoms.

[4] The book contains more than 120,000 Chinese characters and is divided into twelve volumes, which describe the geography, land and maritime transportation, climate, local products, people, language, history, politics, economic life, religion, culture, and customs in 110 countries, regions and city-states from Xinjiang to Afghanistan, Eastern Iran, Tajikistan, Uzbekistan, Nepal, Northern India, and Sri Lanka, among other regions.

[1] The book is known for having "exact descriptions of distances and locations of different places",[1] and has served as a guidebook for the excavation of many important sites, such as Rajagrha, the Temple at Sarnath, the Ajanta Caves, the ruins of the Nalanda mahāvihāra (great monastery) in Bihar,[1] and the ruins of Vasu Bihar in the ancient city of Pundra.