China said on Tuesday it was "firmly opposed" to a planned visit by Tibetan spiritual leader the Dalai Lama to Arunachal Pradesh, an Indian region at the centre of a border dispute with China.

"China's position on so-called Arunachal Pradesh is consistent and clear and we firmly oppose the Dalai Lama's visit to the region," foreign ministry spokesman Ma Zhaoxu told reporters.

"China is greatly concerned over the news. We believe this further exposes the Dalai Lama's nature of anti-China separatism, as is known to all," Ma added.

Foreign Secretary Nirupama Rao last week reaffirmed the right of the India-based Dalai Lama to visit the region, despite previous strong objections from China.

India says China occupies 38,000 square kilometres (14,700 square miles) of Arunachal Pradesh, while Beijing claims all of the Himalayan region, which covers 90,000 square kilometres.

"The Dalai Lama is a religious figure and he does not indulge in political activities," Rao said on Friday, according to The Indian Express newspaper.

"He is our guest in India and he is free to visit any part of our country."

The Dalai Lama, who fled to India in 1959 after China crushed an anti-Chinese uprising in Tibet, is denounced by Beijing as a "splittist" despite his calls for autonomy rather than full independence for his homeland.