陜西(xi)合陽徐水河(he)國家濕地公(gong)園(yuan)橫貫縣境北部(bu)，為黃(huang)(huang)河(he)晉(jin)陜段南(nan)北向寬闊(kuo)河(he)谷(gu)右岸黃(huang)(huang)河(he)一級支流，西(xi)北起渭北黃(huang)(huang)土高原(yuan)黃(huang)(huang)龍山系(xi)的皇甫(fu)莊林(lin)場上(shang)馬西(xi)，東南(nan)至百良鎮(zhen)岔峪口(kou)，與陜西(xi)黃(huang)(huang)河(he)濕地省(sheng)級自然(ran)保護(hu)區(qu)(qu)(qu)(qu)(qu)相接(jie)，全長36.4公(gong)里，總面(mian)(mian)積(ji)1386公(gong)頃。濕地公(gong)園(yuan)共分為五個功(gong)能區(qu)(qu)(qu)(qu)(qu)：保護(hu)保育區(qu)(qu)(qu)(qu)(qu)，面(mian)(mian)積(ji)1075公(gong)頃；恢復重(zhong)建(jian)區(qu)(qu)(qu)(qu)(qu)，面(mian)(mian)積(ji)156公(gong)頃；宣教展(zhan)示(shi)區(qu)(qu)(qu)(qu)(qu)，面(mian)(mian)積(ji)40公(gong)頃；合理利用(yong)區(qu)(qu)(qu)(qu)(qu)，面(mian)(mian)積(ji)100公(gong)頃；管理服務區(qu)(qu)(qu)(qu)(qu)，面(mian)(mian)積(ji)15公(gong)頃。保護(hu)保育區(qu)(qu)(qu)(qu)(qu)和恢復重(zhong)建(jian)區(qu)(qu)(qu)(qu)(qu)占總面(mian)(mian)積(ji)的88.8%。
濕(shi)(shi)地(di)(di)公(gong)園(yuan)共分五個功能區：保(bao)護(hu)(hu)保(bao)育區西(xi)北起皇甫莊林場的上馬西(xi)，南至(zhi)百(bai)(bai)(bai)良(liang)鎮百(bai)(bai)(bai)良(liang)水庫壩頂(ding)，面積1075公(gong)頃，這是濕(shi)(shi)地(di)(di)公(gong)園(yuan)的核心和(he)生態基質。恢復重(zhong)建區西(xi)起百(bai)(bai)(bai)良(liang)鎮百(bai)(bai)(bai)良(liang)水庫壩頂(ding)，東(dong)至(zhi)百(bai)(bai)(bai)良(liang)鎮上黨(dang)河(he)村，面積156公(gong)頃，以恢復和(he)重(zhong)建完整濕(shi)(shi)地(di)(di)生態系統為主，著(zhu)力(li)建設良(liang)好(hao)的生態廊(lang)道，宣教展(zhan)示區西(xi)起百(bai)(bai)(bai)良(liang)鎮上黨(dang)河(he)村，東(dong)至(zhi)百(bai)(bai)(bai)良(liang)鎮郭(guo)家河(he)村，面積40公(gong)頃，以典型(xing)河(he)流(liu)濕(shi)(shi)地(di)(di)、庫塘濕(shi)(shi)地(di)(di)為載(zai)體，主要向游客(ke)展(zhan)示濕(shi)(shi)地(di)(di)科(ke)普知識。合理(li)(li)利(li)用區西(xi)起百(bai)(bai)(bai)良(liang)鎮郭(guo)家河(he)村，東(dong)至(zhi)岔峪口，面積100公(gong)頃，以保(bao)護(hu)(hu)為前提，彰顯(xian)濕(shi)(shi)地(di)(di)文(wen)化，著(zhu)力(li)打造黃河(he)之濱休閑(xian)濕(shi)(shi)地(di)(di)。管(guan)理(li)(li)服務(wu)區面積15公(gong)頃，主要履行(xing)管(guan)理(li)(li)和(he)服務(wu)職能。
陜(shan)西合陽徐水河國(guo)家濕(shi)地公園的建設，對于打造(zao)西北地區(qu)具有代表(biao)性半干旱區(qu)河流型國(guo)家濕(shi)地公園示范，對于保護(hu)黃河濕(shi)地生物多樣性、強化陜(shan)西省濕(shi)地保護(hu)體系、維系黃河水生態安(an)全有著重要(yao)意義(yi)。
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