China on Monday reaffirmed that the Zangnan region is its territory and rejected the so-called "Arunachal Pradesh" illegally established by India.

Foreign Ministry spokesman Guo Jiakun made the remarks in a statement after India reportedly published "standard names" for 27 locations in "Arunachal Pradesh" on Aug 7.

India's Ministry of Home Affairs said in a statement that formally identifying the locations on the map was aimed at "facilitating their accurate recognition and better awareness among the public at large".

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Guo said India's attempt to replace names long used by China with its so-called "standard names" is illegal, null and void.

"Still less will it change the fact that Zangnan region belongs to China," he added.