Seguin, Texas is located in south-central Texas, 35 miles east of San Antonio. It is located at the boundary between the Texas Blackland Prairie to the north and the Post Oak Woodlands to the south and east. Most of the surrounding area is now agricultural, primarily cattle grazing. Much of this land is covered with mesquite trees and a large variety of trees, shrubs and herbaceous plants that provide a fairly diverse environment for birds. The city is located on the Guadalupe River. Large pecan and cypress trees line the river, including the public Starcke Park area. Several small reservoirs are located along the river near town, including Lake Dunlap, McQueeney, and Placid. These provide good viewing areas for waterfowl.
Three species that are common near Seguin may be of special interest to birders from other regions. Scissor-tailed Flycatchers are common during the breeding season. Look for them on fences and telephone wires anywhere in the countryside around Seguin. Crested Caracaras are also common in the countryside, and are especially visible when feeding on road-kill carcasses, often in the company of Turkey Vultures. Flocks of Black-bellied Whistling Ducks can often be seen standing along the banks of the area lakes. They are also sometimes seen on open lawn areas in town or flying overhead at dusk.