Taiwanese legislators arrived Wednesday on a South China Sea island that Taiwan administers to assert sovereignty after an international tribunal ruled last week that the island is legally only a "rock."

Democratic Progressive Party legislators Lo Chih-cheng and Wang Ding-yu, both members of the legislature's Foreign and National Defense Committee, wrote on their Facebook pages that they and six other lawmakers embarked on a day trip to Taiping Island early in the morning.

Taiping Island, or Itu Aba, is the largest naturally formed feature in the Spratly Archipelago and is located some 1,600 km south of Taiwan. The flight to the island takes about four hours.