The Philippines -- one of the most vocal of China's neighbours in defending its competing territorial claim -- reacted strongly, calling for the Asian giant to "dismantle" the reclaimed land.
"They have to dismantle it," said Peter Paul Galvez, spokesman for Manila's defence department. "It is a concern not only of our country and region but of the whole international community."
A series of satellite images posted on the website of the Center for Strategic and International Studies show a flotilla of Chinese vessels dredging sand onto Mischief Reef and the resulting land spreading in size.
Analysts say the pictures show how China is attempting to create facts in the water to bolster its sovereignty claims.
Beijing asserts sovereignty over almost the whole of the South China Sea, including areas close to the coasts of other littoral states, using a nine-segment line based on one that first appeared on Chinese maps in the 1940s.
The Philippines, Vietnam, Malaysia, Brunei and Taiwan all have overlapping claims.
"China exerts indisputable sovereignty over the Nansha islands and affiliated waters," said foreign ministry spokeswoman Hua Chunying, using the Chinese name for the islands, which literally means "Southern Sand".
The works were to "safeguard the territorial sovereignty and maritime rights and interests of China", she said, adding: "We will build more civilian facilities."
The Philippines has taken its sovereignty claim to the United Nations for arbitration, a process rejected by Beijing.
Manila has troops stationed on some islands it controls, which also have civilian residents.
"As we have mentioned more than once, actually since this administration started, we have been warning everyone of the implications of their (China's) actions, of their aggressive means so like today, these reclamations... Will have further implications in the long term," defence spokesman Galvez told AFP.
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