Lansdowne Reef

Lansdowne Reef (Bahura ng Pagkakaisa); Len Đao Reef (Đá Len Đao); Mandarin, is a cay on the southern part of the Union Banks of the Spratly Islands in the South China Sea. The island has been occupied by Vietnam since 1988. It is also claimed by China (PRC), the Philippines, Vietnam, and Taiwan (ROC).

Lansdowne Reef stretches for 3.3 km between its western and northeastern extremities and reaches 900 m along the north-south axis. A tower with a diameter of 15 to 20 meters was built in the center of the reef plain with a diameter of 30 meters.