Simplify the following text for a Grade 8 native English-speaking person.
Original: The Wuyi Mountains are a mountain range with an area of 60 kmÂ that cover the northern border of Fujian province with Jiangxi province , China .
Simplified: The Wuyi Mountains are a mountain range located in the prefecture of Nanping , in the northern border of Fujian province with Jiangxi province , China . The mountains cover an area of 60 kmÂ .