河南省地处中原,北、西、南三面分别由太行山、伏牛山、桐柏山和大别山等四大山脉环抱。全省面积十六万平方公里。其中山区约占26％,丘岭地区约占18％,平原地区约占56％。省辖17个地(市),119个县、市,2208个乡、镇;总人口7554119人。由于广大山丘地区外环境缺碘,地方甲状腺肿(简称地甲病)在全省广泛流行,成为危害 Located in the Central Plains, North, West and South of Henan Province, Henan Province is surrounded by four major mountains, namely Taihang Mountain, Funiu Mountain, Tongbai Mountain and Dabie Mountain respectively. The province covers an area of ​​160,000 square kilometers. Among them, about 26% are in mountainous area, 18% in Qiu Ling area and 56% in plain area. Provincial jurisdiction 17 (cities), 119 counties, cities, 2208 townships, the town; the total population of 7554119 people. Due to the lack of iodine in the vast hills, the local goiter (referred to as toke disease) is widely prevalent in the province and endangered