The company said they would be undertaking "rigorous reviews" to ensure that it doesn't happen again.
The company took action after photos began circulating on Chinese social media of a T-shirt showing a map that didn't include Taiwan, a self-ruled island that Beijing regards as Chinese territory.
In the statement sent to the Global Times, Gap said the T-shirt has been pulled off shelves in the Chinese market and destroyed. US clothing retailer Gap has apologized Monday, May 14, 2018, for selling T-shirts with what it says was an "erroneous" map of China.
China has engaged in a campaign this year to force worldwide companies to toe the line when it comes to Taiwan and its "One China" policy.
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China, which considers Taiwan a rebel province awaiting reunification, has taken airlines, hotels and other companies to task in recent months for listing the island as a separate country on their websites. Vietnam, the Philippines, India and Taiwan all protested against the move.
U.S. clothing retailer Gap has apologised for selling T-shirts with what it says was an "erroneous" map of China that did not include territories claimed by China, following a burst of outrage on Chinese social media.
The U.S. has started pushing back against Beijing, with the White House condemning China's efforts to control how U.S. airlines refer to Taiwan, Hong Kong and Macau as "Orwellian nonsense".
Other than Marriott, the Chinese websites of US-based medical supplies company Medtronic and Spanish fashion brand Zara were found to have listed Taiwan as a "country" or as "Republic of China" and were ordered by the government to make corrections and apologise, state media Xinhua Agency has reported.
Worldwide fashion brand Zara was also ordered by the internet regulator in Shanghai to update its website after listing Taiwan as a country, medical equipment maker Medtronic was also ordered to publicly apologise on its website for making the same mistake.