发源于河北省涞源县太行山东麓的拒马河流经北京市房山区，流至张坊镇分成南北二支，北支称北拒马河。北拒马河顺涿州而下与大石河、小清河汇流南折流至白沟镇。因此，涿州因山区泄洪造成大量积水。

juzhangkaijieshao，daoyouguakaozailvxingshehuozhelvyouxingyejigou，fenweizhuanzhidaoyouhejianzhidaoyou，qianzhegudingfuwuyuyijialvxingshe，houzhezekeyigeiduojialvxingshedaituan，danyibanbuhuiqiandinglaodonghetong。zhuanzhidaoyouzaidanjiyeyoutuandai，erjianzhidaoyouzhiyouwangjicaihuiyouhuo。据(ju)张(zhang)凯(kai)介(jie)绍(shao)，(，)导(dao)游(you)挂(gua)靠(kao)在(zai)旅(lv)行(xing)社(she)或(huo)者(zhe)旅(lv)游(you)行(xing)业(ye)机(ji)构(gou)，(，)分(fen)为(wei)专(zhuan)职(zhi)导(dao)游(you)和(he)兼(jian)职(zhi)导(dao)游(you)，(，)前(qian)者(zhe)固(gu)定(ding)服(fu)务(wu)于(yu)一(yi)家(jia)旅(lv)行(xing)社(she)，(，)后(hou)者(zhe)则(ze)可(ke)以(yi)给(gei)多(duo)家(jia)旅(lv)行(xing)社(she)带(dai)团(tuan)，(，)但(dan)一(yi)般(ban)不(bu)会(hui)签(qian)订(ding)劳(lao)动(dong)合(he)同(tong)。(。)专(zhuan)职(zhi)导(dao)游(you)在(zai)淡(dan)季(ji)也(ye)有(you)团(tuan)带(dai)，(，)而(er)兼(jian)职(zhi)导(dao)游(you)只(zhi)有(you)旺(wang)季(ji)才(cai)会(hui)有(you)活(huo)。(。)