other countries in the South China Sea (the Philippine, Malaysia, Vietnam, Indonesia, Brunei and Taiwan) have disputed China's claims on the islands. China has reacted by posting a large naval presence throughout the region. it has also started to construct artificial islands and expand others. these islands have supported the construction of ports, military bases and bases for oil exploration. the creation of new islands has caused disruption to fish breeding cycles and dredging has destroyed coral reeds in the area