The Diaoyu islands have a long history as part of China's territory , belonging to the country since ancient times. They are located  to the northeast of China's Taiwan Island, The total landmass of these islands   is about 5.69 square kilometers. Since the Japanese government "bought" the Diaoyu Islands, the tension  between China and Japan about the islands has gone up. Several major Shanghai travel agencies have decided to stop organizing tours to Japan and advised Japan-bound   tourists to make other plans, becauese of the Diaoyu Islands issue . The Shanghai China CYTS Outbound Travel Service Co. Ltd.  stopped the tour to Japan and will gradually stop receiving tourist bookings  to Japan after the National Day holiday, according to Liu Xin, the company's manager. The Shanghai branch of the China Travel International Ltd.   also said it was advising people who wanted to visit Japan to change their plans. In fact, tourists had already begun to ask for cancellation  of their tours to Japan because they were worried about their safety. Last year, more than 100,000 tourists from  Shanghai went to Japan on organized tours. That made Japan the second most popular tour place for travelers from the city, only after Thailand. This passage may be   _  .
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