Claim: Dacheng County is located in Langfang prefecture-level city (known as Tianjin Prefecture until 1973), Hebei province, China.
Evidence: Langfang Langfang (Chinese: 廊坊), is a prefecture-level city of Hebei Province, which was known as Tianjin Prefecture until 1973. People's Republic of China Hebei 
It is the southernmost county-level division of the prefecture-level city of Langfang. 'Great City') is a county in the central part of Hebei province, China, bordering Tianjin to the northeast. Langfang (Chinese: 廊坊), is a prefecture-level city of Hebei Province, which was known as Tianjin Prefecture until 1973.