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Aerial photo taken on May 29, 2020 shows a view of the under-construction China-Laos Railway running through the outskirts of the Lao capital Vientiane. Laos is the only landlocked country in Southeast Asia. In the central part of the country, the capital Vientiane is located on the alluvial plain on the Mekong River, suitable for fishing and plantation. The Lan Xang Kingdom, the first unified multi-ethnic nation in the history of Laos, moved its capital to Vientiane in the mid-16th century, and Vientiane gradually prospered. (Photo by Pan Longzhu/Xinhua)
