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Formed in Carboniferous/Permian limestone, the main Sơn Đoòng cave passage is the largest known cave passage in the world by volume – 3.84 × 10 7 m 3 (1.36 × 10 9 cu ft), according to BCRA expedition leader Howard Limbert. It is more than 5 kilometres (3.1 mi) long, 200 metres (660 ft) high and 150 metres (490 ft) wide.
River gateway to the ancient capital of Hoa Lư Typical limestone mountain in the area of Hoa Lư. Hoa Lư was the capital of Vietnam from 968 to 1009. It lies in Trường Yên Thượng village, Hoa Lư, Ninh Bình Province. The area is one of ricefields broken by limestone mountains, and is approximately 90 km south of Hanoi.
Hoa Lư Ancient Capital, a historical capital of Vietnam Topics referred to by the same term This disambiguation page lists articles about distinct geographical locations with the same name.
The formation of the limestone layer more than 1,000 m thick. A shallow and warm sea reformed, which existed for approximately 100 million years. It created two kinds of limestone: the Cát Bà layer of the early Carboniferous period (450 m thick); and the Quang Hanh layer of the middle Carboniferous and the early Permian period (750 m thick ...
It contains limestone karst peaks with valleys. There are archaeological traces of human activity for more than 30,000 years, dating back from the Neolithic and Bronze Ages. Hoa Lư was the ancient capital of Vietnam, established in the 10th and 11th centuries. [6] [26]
In the Trang An landscape complex, the center of Hoa Lu ancient capital in the north, Tam Coc - Bich Dong tourist area is in the south and Trang An eco-tourism area is in the central position. These three areas are linked together by Hoa Lu special-use forest on limestone mountains and rivers, lakes and swamps
The citadel of Ninh Bình (1884) The name of Ninh Binh officially existed since 1822. [1] During the Nguyen dynasty, in August 1884 in the Tonkin campaign, the allegiance of Ninh Bình was of considerable importance to the French, as artillery mounted in its lofty citadel controlled river traffic to the Gulf of Tonkin.
Marble Mountains (Vietnamese: Ngũ Hành Sơn, Chữ Hán: 五行山; lit. "five elements mountains") is a cluster of five marble and limestone hills located in Ngũ Hành Sơn District, south of Da Nang city in Vietnam. The five mountains are named after the five elements: Kim (metal), Thủy (water), Mộc (wood), Hỏa (fire) and Thổ (earth).