Vietnam coastline is long. At its narrowest point in the central Quảng Bình Province, the country is as little as across, though it widens to around in the north. Vietnam's land is mostly hilly and densely forested, with level land covering no more than 20%. Mountains account for 40% of the country's land area, and tropical forests cover around 42%. The northern part of the country consists mostly of highlands and the Red River Delta. Fansipan (also called as Phan Xi Păng) which is located in Lào Cai Province is the highest mountain in Vietnam, standing high. The Red River Delta
Pang Xun of the men of Xu Prefecture was carried out, gathering some 30,000 men. Xu Ji and the others offered the titles of General Tiance (天冊將軍) and "Brilliance Prince of the Congregation" (大會明王) to Pang, although Pang only accepted the General Tiance title at that time. Pang, leaving Xu and his father Pang Juzhi in charge at Xu Prefecture, departed Xu Prefecture on May 23, first attacking the Weibo troops, which had been attacking the rebel-controlled Feng County, Jiangsu, catching Weibo forces by surprise. He crushed the Weibo forces, and Taining forces, hearing of Weibo forces' defeat, also withdrew. Pang gathered