Please answer a question about the following article about Hokkien:

The term Hokkien (福建; hɔk˥˥kɪɛn˨˩) is itself a term not used in Chinese to refer to the dialect, as it simply means Fujian province. In Chinese linguistics, these dialects are known by their classification under the Quanzhang Division (Chinese: 泉漳片; pinyin: Quánzhāng piàn) of Min Nan, which comes from the first characters of the two main Hokkien urban centers Quanzhou and Zhangzhou. The variety is also known by other terms such as the more general Min Nan (traditional Chinese: 閩南語, 閩南話; simplified Chinese: 闽南语, 闽南话; pinyin: Mǐnnányǔ, Mǐnnánhuà; Pe̍h-ōe-jī: Bân-lâm-gí,Bân-lâm-oē) or Southern Min, and Fulaohua (traditional Chinese: 福佬話; simplified Chinese: 福佬话; pinyin: Fúlǎohuà; Pe̍h-ōe-jī: Hō-ló-oē). The term Hokkien (Chinese: 福建話; Pe̍h-ōe-jī: hok-kiàn oē;Tâi-lô:Hok-kiàn-uē), on the other hand, is used commonly in South East Asia to refer to Min-nan dialects.

Where are quanzhou and Zhangzhou located?
Hokkien