According to Baidu map, Guangzhou is located in south-central Guangdong Province, which is the capital of Guangdong Province, while Jiangmen is located in south-central Guangdong Province, which is one of the central cities in the west of the Pearl River Delta. Jiangmen is about100km from Guangzhou. When driving from Guangzhou to Jiangmen, you usually take Guangzhou West Line, Guangfo Zhu Jiang Expressway, and then transfer to Guangzhongjiang Expressway. The whole journey takes about 1 hour and 40 minutes.
From Jiangmen to Guangzhou, you can also take the Guangzhou Pearl River Intercity Railway to Guangzhou South Station, where you can transfer to Guangzhou Metro Line 2 or Line 7 to Guangzhou downtown.