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This picture taken on October 1, 2013 shows Hmong ethnic hill tribe women harvesting rice on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879759 )

This picture taken on October 2, 2013 shows terrace rice fields in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879812 )

This picture taken on October 2, 2013 shows a Hmong ethnic hill tribe woman harvesting rice on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879752 )

This picture taken on October 2, 2013 shows a Hmong ethnic hill tribe woman harvesting rice on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879757 )

This picture taken on October 1, 2013 shows a Hmong ethnic hill tribe woman harvesting rice on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879823 )

This picture taken on October 1, 2013 shows Hmong ethnic hilltribe women thrashing bunches of paddy against a wooden box as they harvest rice on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879777 )

This picture taken on October 2, 2013 shows Hmong hill tribe families harvesting rice on terrace rice fields in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879803 )

This picture taken on October 2, 2013 shows terrace rice fields in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879809 )

This picture taken on October 2, 2013 shows a Hmong ethnic hill tribe woman walking on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879745 )

This picture taken on October 1, 2013 shows a Hmong ethnic hilltribe man pourring down paddy seeds from height in a way that wind will extract empty seeds during a rice harvesting on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879831 )

This picture taken on October 1, 2013 shows a Hmong ethnic hilltribe family having lunch during a rice harvesting on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879805 )

This picture taken on October 1, 2013 shows Hmong hilltribe women having lunch as they harvest rice on terrace rice fields in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879818 )

This picture taken on October 2, 2013 shows terrace rice fields in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879816 )

This picture taken on October 2, 2013 shows Hmong hill tribe families harvesting rice on terrace rice fields in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879800 )

This picture taken on October 1, 2013 shows Hmong ethnic hilltribe women thrashing bunches of paddy against a wooden box as they harvest rice on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879790 )

This picture taken on October 2, 2013 shows a Hmong ethnic hill tribe woman harvesting rice on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879772 )

This picture taken on October 1, 2013 shows Hmong ethnic hilltribe women thrashing bunches of paddy against a wooden box as they harvest rice on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879792 )

This picture taken on October 1, 2013 shows a Hmong ethnic hilltribe woman carrying a wooden box used to thresh bunches of paddy on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879794 )

This picture taken on October 1, 2013 shows Hmong ethnic hilltribe women harvesting rice on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879797 )

This picture taken on October 2, 2013 shows a Hmong ethnic hill tribe man harvesting rice on a terrace rice field in Mu Cang Chai district, in the northern mountainous province of Yen Bai. The local residents, mostly from the Hmong hill tribe, grow rice in the picturesque terrace fields whose age is estimated to hundreds years. Due to hard farming conditions, especially irrigation works, locals produce only one rice crop per year. In recent years a growing numbers of tourists have been attracted by the beautiful landscapes created by the region's rice terrace fields. HOANG DINH NAM/AFP/Getty Images ( 523879767 )