San Marcos is a city and the county seat of Hays County, Texas, United States. The city is a part of the Greater Austin Metropolitan Area. San Marcos's limits extend into Caldwell and Guadalupe counties, as well. San Marcos is on the Interstate 35 corridor between Austin and San Antonio. Its population was 44,894 at the 2010 census and 67,553 at the 2020 census. Founded on the banks of the San Marcos River, the area is thought to be among the oldest continuously inhabited sites in the Americas. San Marcos is home to Texas State University and the Meadows Center for Water and the Environment.
Barton Springs is a set of four natural water springs located at Barton Creek on the grounds of Zilker Park in Austin, Texas, resulting from water flowing through the Edwards Aquifer. The largest spring, Main Barton Spring, supplies water to Barton Springs Pool, a popular recreational destination in Austin. The smaller springs are located nearby, two with man-made structures built to contain and direct their flow. The springs are the only known habitat of the Barton Springs Salamander, an endangered species.
An underwater environment is a environment of, and immersed in, liquid water in a natural or artificial feature, such as an ocean, sea, lake, pond, reservoir, river, canal, or aquifer. Some characteristics of the underwater environment are universal, but many depend on the local situation.
The fountain darter is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is found in the headwaters of only two rivers in Texas, United States: the Comal River and the San Marcos River. It is generally smaller than 3 cm (1.2 in) long and feeds on small invertebrates. It is a federally listed endangered species of the United States and is also listed as endangered by the IUCN.
Barton Creek is a tributary that feeds the Colorado River as it flows through the Texas Hill Country. The creek passes through some of the more scenic areas in Greater Austin, surrounded in many parts by a greenbelt of protected lands that serves as a habitat for many indigenous species of flora and fauna. The creek passes through Barton Creek Greenbelt and is fed by Barton Springs.
The San Marcos River rises from the San Marcos Springs, the location of the Meadows Center for Water and the Environment, in San Marcos, Texas. The springs are home to several threatened or endangered species, including the Texas blind salamander, fountain darter, and Texas wild rice. The river is a popular recreational area, and is frequented for tubing, canoeing, swimming, and fishing.
The Edwards Aquifer is one of the most prolific artesian aquifers in the world. Located on the eastern edge of the Edwards Plateau in the U.S. state of Texas, it is the source of drinking water for two million people, and is the primary water supply for agriculture and industry in the aquifer's region. Additionally, the Edwards Aquifer feeds the Comal and San Marcos Springs, provides springflow for recreational and downstream uses in the Nueces, San Antonio, Guadalupe, and San Marcos river basins, and is home to several unique and endangered species.
Amistad Reservoir is a reservoir on the Rio Grande at its confluence with the Devils River 12 miles (19 km) northwest of Del Rio, Texas. The lake is bounded by Val Verde County on the United States side of the international border and by the state of Coahuila on the Mexican side of the border; the American shoreline forms the Amistad National Recreation Area. The reservoir was formed in 1969 by the construction of Amistad Dam. The dam and lake are managed jointly by the governments of the United States and Mexico through the International Boundary and Water Commission. The name of the dam and lake is the Spanish word for "friendship". The reservoir is also known as Lake Amistad.
The San Marcos salamander is a small species of aquatic, lungless salamander native to the United States, endemic to Spring Lake and a small region of the headwaters of the San Marcos River near Aquarena Springs, in Hays County, Texas. It is one to two inches long, with a slender body and external gills, and is reddish-brown in color.
San Marcos Springs is the second largest natural cluster of springs in Texas. The springs are located in the city of San Marcos, Texas, about 30 miles (48 km) southwest of Austin and 46 miles (74 km) northeast of San Antonio.
San Pedro Springs is the name of a cluster of springs in Bexar County, Texas, United States. These springs provide water for San Pedro Creek, which flows into the San Antonio River. The San Antonio Springs also feed into the San Antonio River.
The San Marcos gambusia is a likely extinct species of Gambusia from the family Poeciliidae that was found only in the San Marcos Springs of Central Texas. The fish has not been seen since 1983.
Newton A. Perry was an American swimmer, attraction promoter, educator and swimming coach.
Stygobromus pecki, the Peck's cave amphipod, is a rare species of crustacean found in four cavern areas of southwestern Texas in the United States. It is a federally listed endangered species in the United States and is also listed as Endangered on the IUCN Red List. Because of the species' limited geographical distribution, not much information on S. pecki is known. As of April 2022, there is no available 5-year review, Species Status Assessment, or recovery plan for the species. However, the Edwards' Aquifer Habitat Conservation Program (EAHCP), with the support of the U.S. Fish and Wildlife Service (UFWS), has been attempting to further study and promote conservation of S. pecki.
Aquarena, or Aquaréna, may refer to:
The Wood River is a short river in the southern region of the U.S. state of Oregon, and part of the Klamath Basin drainage. It flows 18 miles (29 km) through the Fremont-Winema National Forests, Bureau of Land Management land, and private property in southern Oregon. Its watershed consists of 220 square miles (570 km2) of conifer forest, rural pasture land, and marsh. The river provides habitat for many species of wildlife including an adfluvial (migratory) and resident populations of native Great Basin redband trout.
Balmorhea State Park is a 46-acre (19 ha) state park located on the San Solomon Springs in Reeves County, Texas, opened in 1968. The closest city is Balmorhea, Texas. Texas Parks and Wildlife Department manages the park. The park is open year-round, and visitation is capped at 900 people per day.
Jacob's Well is a perennial karstic spring in the Texas Hill Country flowing from the bed of Cypress Creek, located northwest of Wimberley, Texas.
Zizania texana is a rare species of grass known by the common name Texas wild rice. It is endemic to Texas, where it is found only on the upper San Marcos River in Hays County. It is threatened by the loss and degradation of its habitat. It is a federally listed endangered species of the United States.
Mount Shasta City Park is an urban park located in the city of Mount Shasta, California, United States. It is one of two parks within the Mt. Shasta Recreation and Parks District and hosts the district's headquarters. The 26 acres (11 ha) park and offers a variety of opportunities for recreation such as hiking, picnicking and biking. Many community events occur within the park buildings and in the surrounding park land. The park is also home to the headwaters of the Upper Sacramento River.
