After leaving Tongzhou, Yuan Zhen was exiled to the remote region of Lingnan, specifically to the city of Guangzhou. This decision was made by Emperor Taizong of the Tang dynasty, who ordered Yuan Zhen's exile due to his political disagreements and involvement in a power struggle. The choice of Lingnan as his destination was strategic, as it was a distant and culturally distinct area from the central government, making it difficult for Yuan Zhen to exert any influence or return to power.

Historical records indicate that Yuan Zhen's exile to Lingnan was not an arbitrary one. The region was known for its harsh climate and isolation, which were intended to serve as deterrents against any potential rebellion or attempts to regain power. The distance from the capital, Chang'an, was approximately 1,200 miles, and the journey would have been arduous, further emphasizing the severity of his punishment.

Yuan Zhen's time in Lingnan was marked by his efforts to adapt to the local culture and climate. He wrote extensively about his experiences, including poems and essays that offer valuable insights into the region's society and his personal struggles. His works, such as "The Journey to Lingnan," provide a vivid account of his journey and the challenges he faced during his exile.

The decision to exile Yuan Zhen to Lingnan was influenced by several factors. Firstly, the Tang dynasty was a time of political intrigue and power struggles, and Emperor Taizong was particularly sensitive to any threats to his authority. Yuan Zhen's involvement in a power struggle and his criticism of the emperor's policies made him a prime target for exile.

Secondly, the choice of Lingnan as an exile destination was a reflection of the dynasty's approach to dealing with political enemies. The region was strategically located far from the capital and was known for its difficult terrain and harsh climate, making it an ideal place to send someone who posed a potential threat to the throne.

Lastly, the cultural and geographical differences between Lingnan and the central regions of the Tang dynasty were significant. The region had a distinct cultural identity and language, which further isolated Yuan Zhen from his former life and social networks.

In conclusion, after leaving Tongzhou, Yuan Zhen was exiled to Lingnan, a remote and culturally distinct region in the southern part of the Tang dynasty. This decision was influenced by political factors, the dynasty's approach to dealing with political enemies, and the geographical and cultural differences between Lingnan and the central regions. Yuan Zhen's time in Lingnan was marked by his efforts to adapt and his extensive writings about his experiences, which provide valuable insights into the region and his personal struggles.