Phong Nha-Kẻ Bàng is a national park and UNESCO World Heritage Site in the Bố Trạch and Minh Hóa districts of central Quảng Bình Province in the North Central Coast region of Vietnam, about 500 km south of Hanoi. The park borders the Hin Namno National Park in Khammouane Province, Laos to the west and 42 km east of the East sea from its borderline point. Phong Nha-Kẻ Bàng National Park is in a limestone zone of 2,000 km2 in Vietnamese territory and borders another limestone zone of 2,000 km2 of Hin Namno in Laotian territory. The core zone of this national park covers 857.54 km2 and a buffer zone of 1,954 km2.

Bố Trạch is a rural district in Quảng Bình province. The district capital is Hoàn Lão township. Bố Trạch borders the capital city of Đồng Hới to the south-east, Tuyên Hóa district and Quảng Trạch district to the north, Quảng Ninh district to the south and Minh Hóa district to the north-west. Bố Trạch is home to Phong Nha-Kẻ Bàng National Park and has 30 communes and townships. As of 2019 the district had a population of 188,375. The district covers 2,123 km2 (820 sq mi).