On the photo above, you’ll see the image of the upper Frio River, which flows through 100,000 acres of magnificent grandeur with clear, cool spring water. The Frio River begins in northern Real County with springs and streams. There are limestone rocks around, creating waterfalls, rapids, and pools to Concan in Uvalde county. Boulders, cliffs, and grassy patches are along the banks, which are shaded by pecans, live oaks, sycamores, and massive, centuries-old cypress trees. Swimming and floating on the Frio River are also two of the most popular summer activities.