三合(he)山(shan)(shan)(shan)(shan),位于平(ping)度城(cheng)西(xi)35公里(li)處的(de)(de)膠萊河東(dong)岸(an)、309國道南側。古稱三戶山(shan)(shan)(shan)(shan),海(hai)拔100余米,因由三座(zuo)(zuo)東(dong)西(xi)向連接而又各(ge)自獨立的(de)(de)山(shan)(shan)(shan)(shan)峰(feng)組成而得(de)名。合(he)山(shan)(shan)(shan)(shan)海(hai)拔雖然(ran)不是很高,但(dan)在(zai)平(ping)西(xi)一(yi)望(wang)無(wu)際的(de)(de)平(ping)原沃野之上(shang),顯(xian)得(de)非(fei)常醒目(mu)而特出。三座(zuo)(zuo)山(shan)(shan)(shan)(shan)峰(feng)以中間一(yi)座(zuo)(zuo)最高,最西(xi)一(yi)座(zuo)(zuo)山(shan)(shan)(shan)(shan)峰(feng)最長(chang),因為各(ge)山(shan)(shan)(shan)(shan)長(chang)度不一(yi),所以較(jiao)佳觀(guan)(guan)測點在(zai)東(dong)北(bei)(bei)距離約有(you)七八公里(li)的(de)(de)辛安西(xi)北(bei)(bei)部的(de)(de)丘陵之上(shang),在(zai)此觀(guan)(guan)望(wang),三座(zuo)(zuo)山(shan)(shan)(shan)(shan)峰(feng)峰(feng)姿很佳,勻稱而美。三座(zuo)(zuo)山(shan)(shan)(shan)(shan)峰(feng)各(ge)有(you)特色:最東(dong)者(zhe)多石(shi)多樹(shu)木,中間者(zhe)最高,最西(xi)者(zhe)最雄壯寬闊。清明時(shi)節,周(zhou)圍村民(min)多到山(shan)(shan)(shan)(shan)上(shang)登(deng)高覽勝,人數眾多,漫山(shan)(shan)(shan)(shan)遍野,亦可(ke)謂一(yi)方勝事。三合(he)山(shan)(shan)(shan)(shan)古跡較(jiao)多。原有(you)漢代祠(ci)院(yuan),據《漢書(shu)》載,為漢武帝(di)所立,惜(xi)已毀滅多年。山(shan)(shan)(shan)(shan)上(shang)原有(you)玉(yu)皇殿、老母廟、朝三亭、佛爺廟等(deng)建筑,工藝(yi)精細,較(jiao)為壯觀(guan)(guan),現已無(wu)存。自然(ran)景觀(guan)(guan)主要有(you)石(shi)門、云磨眼、羊奶泉、玉(yu)石(shi)坑、牽馬胡同、仙人腳(jiao)印、道士井等(deng),部分尚(shang)殘存,現重建禪窟寺。
三合山難溝壑中特有一種石頭,大小不等,名“干勾石”,又叫鈴鐺石,形態各異,大者如拳,小者如指,形如鳥似獸。其體內有隙,石中有石而各自獨立,因此搖動會發出叮咚之聲,深受人們喜受。解放戰爭時期,三合山曾是出名的(de)膠(jiao)東(dong)保(bao)衛戰(zhan)(zhan)(zhan)膠(jiao)河戰(zhan)(zhan)(zhan)役(當(dang)地稱三合(he)山戰(zhan)(zhan)(zhan)役)的(de)戰(zhan)(zhan)(zhan)場。1947年10月(yue),中國人民解放軍在(zai)此經(jing)過(guo)7個晝夜浴血奮戰(zhan)(zhan)(zhan),殲敵1.2萬余人,扭轉了整(zheng)個膠(jiao)東(dong)戰(zhan)(zhan)(zhan)局。作(zuo)為(wei)歷史遺(yi)存,山上因戰(zhan)(zhan)(zhan)爭留下了十幾個深達數百米(mi)的(de)巖洞,成為(wei)現(xian)在(zai)人們探(tan)幽訪勝的(de)一(yi)大(da)樂趣(qu)所(suo)在(zai)。