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Điện Biên Phủ lies in Mường Thanh Valley, a 20 km (12 mi) long and 6 km (3.7 mi) wide basin sometimes described as "heart-shaped." It is on the western edge of Điện Biên Province, of which it is the capital, and is only about 10 kilometres (6.2 mi) from the border with Laos .