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丹江是汉江的主要支流,是丹江口水库的重要流域区,发源于陕西省商县秦岭南坡凤凰山,豫鄂省交界处,集水面积14714km2,其中南阳市5789km2,主要支流是淇河、老灌河和滔河。老灌河发源于栾川县西伏牛山主峰北麓、西南流至卢氏县五里川乡后折向东南,经朱阳关入西峡县境,穿西峡、淅川县境,在淅川县老城东双河镇附近入丹江。干流全长255km,流域面积4219km2,属南阳市面积3266km2。
Danjiang River is the main tributary of the Han River and is an important drainage area of the Danjiangkou Reservoir. It originated from the junction of Fenghuang Mountain and Yu’er Province on the southern slope of Shangling County, Shaanxi Province. The catchment area is 14714km2, of which 5789km2 is in Nanyang City. The main tributaries are Qihe, Old Irrigation and Tao River. The old irrigation river originated in Luanchuan County, the western peak of Funiu Mountain peak, southwest flow to Lushi Wuli Township after the fold to the southeast, by Zhu Yang into Xixia County, Xixia, Xichuan County, in Xichuan County Dongshenghe near the town into the Danjiang River. The total length of the main stream is 255km and the basin area is 4219km2, which belongs to Nanyang with an area of 3266km2.