article_snippet.sent: The ruins range along the inner coast of the Yellow River in Gansu province and the Ningxia region the Yellow River in Gansu province and the Ningxia region Gansu province and the Ningxia region the Ningxia region .
article_snippet.sent: Mr Zhou said China's first emperor ordered for the stretch to be built along the Yellow River to stop invaders crossing the Yellow River when the Yellow River was frozen.
article_snippet.sent: The formidable fortress covers approximately 5,500 miles from the Jiayu Pass in Gansu province and the Shanhai Pass in Gansu province.
highlights_snippet.sent: China’s first emperor built China to stop invaders crossing the Yellow River .