Nan'ao or Nanao, formerly romanized Namoa, is an island and county of the prefecture-level city of Shantou in Guangdong Province, China. The county spans a land area of 114.74 square kilometres (44.30 sq mi), and sea area of 4,600 square kilometres (1,800 sq mi). As of 2019, the county had a permanent population of approximately 62,600.

The Taiwan Strait is a 180-kilometer -wide strait separating the island of Taiwan and Asian continent. The strait is part of the South China Sea and connects to the East China Sea to the north. The narrowest part is 130 km wide.