The Comal River is the shortest navigable river in the state of Texas in the United States. Proclaimed the "longest shortest river in the world" by locals, it runs entirely within the city limits of New Braunfels in southeast Comal County. It is a tributary of the Guadalupe River. The Comal begins at Comal Springs in Landa Park and flows 2.5 miles (4.0 km) until its junction with the Guadalupe.

New Braunfels is a city in Comal and Guadalupe counties in the U.S. state of Texas. It is the seat of Comal County. The city covers 44.9 square miles (116 km2) and had a population of 90,403 as of the 2020 Census. A suburb just north of San Antonio, and part of the Greater San Antonio metropolitan area, it was the third-fastest-growing city in the United States from 2010 to 2020. As of 2022, the U.S. Census Bureau estimates its population at 104,707.