Southwest Cay (Chinese: 南子岛; pinyin: Nanzi Dao; Tagalog: Pugad; Vietnamese: Đảo Song Tử Tây) is an islet in the northern edge of Spratly Islands in South China Sea. It is part of North Danger Reef, and just 1.75 miles from Northeast Cay. With an area of 12 hectares, it is the sixth largest Spratly island and the second largest among the Vietnamese-occupied Spratly islands. The island is also claimed by the People's Republic of China, Republic of China (Taiwan) and the Philippines.
Southwest Cay holds the archipelago's highest point, at 4 meters above sea level; was once a breeding place for birds and covered with trees and guano. Export of guano had been carried out "on a considerable scale."
Read more about Southwest Cay: History