\u0110\u1ed9ng Phong Nha thu\u1ed9c v\u00f9ng n\u00fai \u0111\u00e1 v\u00f4i Phong Nha \u2013 K\u1ebb B\u00e0ng. N\u1eb1m \u1edf\u00a0x\u00e3 S\u01a1n Tr\u1ea1ch, huy\u1ec7n B\u1ed1 Tr\u1ea1ch, t\u1ec9nh Qu\u1ea3ng B\u00ecnh. C\u00e1ch th\u00e0nh ph\u1ed1 \u0110\u1ed3ng H\u1edbi kho\u1ea3ng 45km v\u1ec1 ph\u00eda t\u00e2y b\u1eafc. \u0110\u1ed9ng Phong Nha \u0111\u01b0\u1ee3c coi l\u00e0 \u201cThi\u00ean Nam \u0111\u1ec7 nh\u1ea5t \u0111\u1ed9ng\u201d c\u1ee7a Vi\u1ec7t Nam. \u0110\u01b0\u1ee3c che ch\u1edf b\u1edfi nh\u1eefng c\u00e1nh r\u1eebng nhi\u1ec7t \u0111\u1edbi.<\/p>\n
B\u1ebfn Thuy\u1ec1n Phong Nha tr\u00ean S\u00f4ng Son<\/p>\n<\/div>\n
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Theo c\u00e1c nh\u00e0 khoa h\u1ecdc, qu\u00e1 tr\u00ecnh phong h\u00f3a t\u1ea1o th\u00e0nh hang \u0111\u1ed9ng \u1edf Phong Nha l\u00e0 qu\u00e1 tr\u00ecnh t\u1ef1 nhi\u00ean \u0111\u00e3 di\u1ec5n ra t\u1eeb c\u00e1ch \u0111\u00e2y 250 tri\u1ec7u n\u0103m. D\u1ea1ng \u0111\u1ecba h\u00ecnh ch\u00ednh c\u1ee7a Phong Nha-K\u1ebb B\u00e0ng l\u00e0 n\u00fai \u0111\u00e1 v\u00f4i v\u00e0 n\u00fai \u0111\u1ea5t. \u0110\u1ed9 cao trung b\u00ecnh 600 m\u00e9t, th\u00e0nh h\u1eb9p, v\u00e1ch \u0111\u1ee9ng. \u0110\u1ed9ng Phong Nha n\u1eb1m \u1edf ph\u1ea7n \u0111\u00f4ng nam kh\u1ed1i n\u00fai \u0111\u00e1 v\u00f4i K\u1ebb B\u00e0ng. Trong m\u1ed9t v\u00f9ng \u0111\u00e1 v\u00f4i b\u1ecb phong h\u00f3a m\u1ea1nh, di\u1ec7n t\u00edch kho\u1ea3ng 10.000 km2, k\u00e9o d\u00e0i 200 km tr\u00ean ph\u00eda b\u1eafc d\u00e3y Tr\u01b0\u1eddng S\u01a1n, th\u00f4ng c\u1ea3 sang L\u00e0o. \u1ede kh\u1ed1i n\u00fai \u0111\u00e1 v\u00f4i n\u00e0y c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng n\u01b0\u1edbc ch\u1ea3y ng\u1ea7m.<\/p>\n
C\u1ea3nh \u0111\u1eb9p th\u01a1 m\u1ed9ng tr\u00ean s\u00f4ng Son \u0111\u01b0\u1eddng v\u00e0o \u0110\u1ed9ng Phong Nha<\/p>\n<\/div>\n
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D\u00f2ng ch\u1ea3y tr\u00ean m\u1eb7t c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y l\u00e0 c\u00e1c con s\u00f4ng Son, Tro\u00f3c, Ch\u00e0y, R\u00e0o Th\u01b0\u01a1ng b\u1eaft ngu\u1ed3n t\u1eeb c\u00e1c con su\u1ed1i nh\u1ecf, \u0111\u1ebfn hang \u00c9n th\u00ec su\u1ed1i l\u1edbn ch\u1ea3y ng\u1ea7m v\u00e0o l\u00f2ng n\u00fai \u0111\u00e1 v\u00f4i \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u00e1c hang \u0111\u1ed9ng.<\/p>\n
C\u1eeda \u0110\u1ed9ng Phong Nha<\/p>\n<\/div>\n
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V\u1edbi chi\u1ec1u d\u00e0i 7.729m, s\u00e2u 83m, cao 50m v\u1edbi r\u1ea5t nhi\u1ec1u nh\u00e1nh hang ph\u1ee5 l\u1edbn nh\u1ecf. Bao g\u1ed3m c\u1ea3 hang Bi K\u00ed, hang Ti\u00ean v\u00e0 hang Cung \u0110\u00ecnh. \u0110\u00e2y l\u00e0 lo\u1ea1i h\u00ecnh \u0111\u1ed9ng n\u01b0\u1edbc ch\u1ea3y ng\u1ea7m trong l\u00f2ng n\u00fai v\u1edbi nhi\u1ec1u th\u1ea1ch nh\u0169 \u0111\u1eb7c tr\u01b0ng. T\u01b0\u01a1ng truy\u1ec1n r\u1eb1ng, ch\u00ednh nh\u1eefng m\u0103ng \u0111\u00e1 r\u0169 xu\u1ed1ng \u1edf c\u1eeda hang \u0111\u00e3 g\u00f3p ph\u1ea7n t\u1ea1o n\u00ean c\u00e1i t\u00ean \u0111\u1ea7y thi v\u1ecb \u201cPhong Nha\u201d, t\u1ee9c l\u00e0 \u201cGi\u00f3 lu\u1ed3n qua k\u1ebd r\u0103ng\u201d.<\/strong><\/p>\n Th\u1ea1ch nh\u0169 \u0110\u1ed9ng Phong Nha<\/p>\n<\/div>\n <\/p>\n Phong Nha n\u1ed5i ti\u1ebfng v\u1edbi nh\u1eefng kh\u1ed1i \u0111\u00e1 \u0111\u1ed9c \u0111\u00e1o \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean theo c\u00e1c h\u00ecnh d\u1ea1ng t\u1ef1 nhi\u00ean. Nh\u01b0 \u201cS\u01b0 t\u1eed\u201d, \u201cK\u1ef3 l\u00e2n\u201d, \u201cV\u00f4 ch\u1ea7u\u201d, \u201cCung \u0111\u00ecnh\u201d hay \u201cT\u01b0\u1ee3ng Ph\u1eadt\u201d. Sau kho\u1ea3ng 19km ch\u1ea3y ng\u1ea7m d\u01b0\u1edbi d\u00e3y Tr\u01b0\u1eddng S\u01a1n. D\u00f2ng s\u00f4ng hi\u1ec7n ra \u1edf c\u1eeda hang mang m\u1ed9t m\u00e0u n\u01b0\u1edbc xanh bi\u1ebfc v\u00e0o m\u00f9a kh\u00f4 v\u00e0 s\u1eafc \u0111\u1ecf v\u00e0o m\u00f9a m\u01b0a. Du kh\u00e1ch c\u0169ng c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 s\u1ef1 ki\u1ebfn t\u1ea1o c\u00e1c m\u0103ng \u0111\u00e1, th\u1ea1ch nh\u0169 t\u1ea1i m\u1ed9t v\u00e0i trong s\u1ed1 14 ph\u00f2ng b\u00ean trong hang \u0111\u1ed9ng. B\u00ean trong kho\u1ea3ng 1km l\u00e0 hang Bi K\u00ed, m\u1ed9t nh\u00e1nh ph\u1ee5 n\u1eb1m s\u00e2u trong \u0111\u1ed9ng Phong Nha c\u00e1ch c\u1eeda \u0111\u1ed9ng kho\u1ea3ng 600m. Ng\u01b0\u1eddi ta tin r\u1eb1ng c\u00f3 m\u1ed9t kho\u1ea3ng th\u1eddi gian n\u00e0o \u0111\u00f3 t\u1eeb th\u1ebf k\u1ef7 IX \u0111\u1ebfn th\u1ebf k\u1ef7 XI, ng\u01b0\u1eddi Ch\u0103m \u0111\u00e3 ch\u1ecdn n\u01a1i \u0111\u00e2y l\u00e0m n\u01a1i th\u1eddi c\u00fang.<\/p>\n<\/a><\/p>\n