Antelope Reef Could Now Be the Largest Island in the South China Sea

Media reporting in early 2026 has highlighted new Chinese dredging and landfill activity at Antelope Reef in the Paracel Islands. This is the first significant artificial island-building Beijing has undertaken in the South China Sea since 2017. But the more consequential-and underreported-development may be the projected size of the artificial island. If construction proceeds at the pace seen in satellite imagery, Antelope Reef is set to become China's largest feature in the Paracels and potentially in the entire South China Sea, equaling or even surpassing the size of Mischief Reef in the Spratlys.

Antelope Reef lies within the Crescent island group in the southwestern part of the Paracels. It is located approximately 162 nautical miles from Sanya Port in China's Hainan province and 216 nautical miles from Da Nang, Vietnam. Previously one of China's smallest outposts in the Paracels, Beijing began major dredging at Antelope in October 2025, and in recent weeks has begun preliminary construction on some areas of the reef.

Using recent commercial satellite imagery from Vantor, AMTI measured the estimated area of reclaimed land at Antelope Reef at roughly 1,490 acres. That figure is striking when compared with the scale of China's features elsewhere in the Paracels. The area's current largest feature is Woody Island which, despite hosting an air and naval base along with Sansha "city" which administers all of the South China Sea, measures only around 890 acres. Mischief, the largest Chinese outpost in the South China Sea, measures 1,504 acres of total land area-a minimal difference from Antelope's current size.

Antelope Reef could now accommodate a 9,000-foot runway of the type China has already constructed at Woody Island, Mischief Reef, Subi Reef, and Fiery Cross Reef. The northwestern side of the new landmass at Antelope, which extends over 11,000 feet, has been fashioned with a noticeably straight outer edge perfect for an airstrip.

While several features in the Crescent island group have harbors, the lagoon at Antelope Reef would dwarf those. This could allow more coastguard along with large numbers of maritime militia to maintain a presence at the reef, as has been common in recent years at Mischief Reef.

Antelope's size would also enable it to accommodate the robust infrastructure seen at Woody and China's "big three" outposts (Mischief, Subi, and Fiery Cross) in the Spratlys, including diesel power plants, underground storage facilities, coastal defense emplacements, surface-to-air and anti-ship missile facilities, as well as numerous surveillance and electronic warfare installations.

Preliminary construction has begun on select portions of the reef. Over 50 small, grey-roofed structures and a helipad have been built near the entrance to the lagoon. Foundations for a larger structure measuring 100 by 60 yards have appeared in the southern corner of the lagoon where several jetties have taken shape. It's likely that at least some of these early structures are temporary facilities that will later be replaced with more permanent infrastructure, as was seen during the construction of China's Spratly outposts.

On its surface, an additional major outpost in the Paracels would provide Beijing with incremental, rather than monumental, gains to its capabilities in the South China Sea. Assuming Antelope is developed into a military facility on par with China's other large outposts, it will extend the reach of Chinese sensing capabilities closer to Vietnam's shores and provide additional capacity and redundancy for its naval and air assets in the northern South China Sea. Antelope's proximity to Hainan could also give Beijing an opportunity to expand its efforts to establish a civilian presence in the Paracels. While this may not significantly change the strategic picture in the South China Sea, Beijing is certainly signaling its ability to continually expand its occupied features-a message perhaps intended most directly for Hanoi, whose own reclamation and landfill activities in the Spratlys remain ongoing.

Ultimately, Beijing's plans for Antelope Reef are uncertain. Satellite imagery can estimate the likely area of reclaimed land, but what will be vital to look out for is how China will develop the island once dredging is complete. Still, the projected scale alone suggests that Antelope could become one of the most important outposts China has built in the South China Sea.