Vietnam has ordered a vehicle importer to remove navigation apps that show maps reflecting Chinese territorial claims that are rejected by Hanoi, adding to a wave of resistance against maps showing the “ nine-dash line ”. The country’s automobile registrar told the importer based in northern Vietnam to take the app out of Chinese-made cars it distributes in the country, said Nguyen To An, head of motor-vehicle quality in the registration office. The maps showed the nine-dash line reflecting China ’s disputed claim to sovereignty over about 80 per cent of the South China Sea . The app ban in Vietnam is part of a widening crackdown by Southeast Asian countries against depictions of disputed territorial delineations. Last week, Vietnamese officials ordered cinemas to halt screenings of Abominable , a DreamWorks Animation feature that showed the nine-dash line on a map. The animated movie also drew calls for a boycott against DreamWorks in the Philippines and was withdrawn from a scheduled debut in Malaysia over the map. Last week, the news website VnExpress reported that the Saigontourist Travel company was slapped with a 50-million-dong (US$2,160) fine for circulating tourism brochures issued by a Chinese city with the nine-dash line included. Vietnam, which fought a war with its fellow communist country along their land border in 1979, has been among the nations pushing back against Beijing’s territorial claims in the South China Sea. China’s nine-dash line encompasses waters the United States has said could contain unexploited hydrocarbons worth US$2.5 trillion.