Developed about 500,000 years ago, Benxi Water Cave in northeast China's Liaoning Province has more than 400,000 cubic meters internal space and a total length of 5,800 meters. Of this, about 2.8 kilometers are accessible by boat. Comprising a dry cave and a water cave, it is the world's longest underground karst cave with water. "ÄÄ…<\/span><\/p>\necns.cn<\/span> (2023-06-04)<\/span>. China strongly opposes so-called 'Initiative on 21st Century Trade': FM.<\/a><\/span> ecns.cn<\/a><\/span> China strongly opposes official interactions of any form between China's Taiwan region and countries that have diplomatic relations with China, and that includes negotiating or signing any agreement that implies sovereignty and has an official nature, Chinese Foreign Ministry Spokesperson Mao Ning said on Friday.<\/span><\/p>\necns.cn<\/span>