how far is pearl river from Huadu District

The distance between these two places is about 22 miles.
If by taxi, it costs CNY 120 to 130 for the single trip in day time.
Or you can take a taxi to get to Xiaogang Metro Station first. The fare is about CNY 80.
Then take subway line 2 to get to Haizhu Plaza Staion. After that, walk south around 250 yards and you can see the river directly. The ticket fare is CNY 4 per person.

You can choose the way you like. :)