What is "longquan"

Longquan is a county-level city under the administration of in the municipal region of Lishui City in the southwest of Zhejiang Province, People's Republic of China, located on the upper reaches of the Ou River.

The city was named Longyuan before the naming taboo under Emperor Gaozu of the Tang Dynasty, whose name was Li Yuan , led to the name changing to Longquan.