Balcones Canyonlands associated with the  Edwards Plateau tip into the northern edge of the San Antonio River Basin, with limestone hills, live oaks, and ash juniper. 

A swath of rich, gently rolling Blackland Prairie occurs a little farther south.  To the east, Post Oak Woodlands make a slender inroad and account for hickory trees and gray squirrels found there.  To the south, all the way to the sea, flat Coastal Prairies give rise to long growing seasons and air laden with moisture.

Near the intersection of these eco-regions,  San Antonio is home to the Alamo, the San Antonio Botanical Garden, the renowned Paseo del Rio (River Walk), the San Antonio Missions National Historical Park, the San Antonio Zoo, and numerous parks, natural areas, and museums.

Trail systems that pass through or near San Antonio include the Texas Independence Trail, El Camino Real de los Tejas, Heart of Texas Trail, Coastal Birding Trail, and Mission Trail.

Click here to view a map of the ecoregions of the Bexar County and Texas.