Answer:
Three cities located on the Trinity River are Dallas and Forth Worth. Houston is also located near it.
The Trinity River is a 1,140-km-long river that originates in northern Texas and flows into the Gulf of Mexico just east of Houston. The river runs through the major cities of Fort Worth and Dallas in its upper course, and is heavily regulated with dams for irrigation, flood control and power generation. It flows southeast, through Lake Livingston Dam into Trinity Bay at the back of Galveston Bay. Its estuary is near Anahuac, southeast of Houston.