Seeps, springs, and tinajas are critical surface water sources in arid and semi-arid regions. They are the primary interface between groundwater and surface water, and serve as important water sources for park fauna and flora. “Seeps” can be defined as restricted subsurface emanations (with surface water not always present). “Springs” are reliable perennial and quasi-perennial surface water sources. Tinajas, or “small jars” in Spanish, are perennial and quasi-perennial surface waters found in naturally occurring bedrock catchments. They are fed by springs and/or precipitation.