Tijuana River Estuary

Tijuana Slough National Wildlife Refuge is located in the most southwestern corner of the contiguous United States. As a National Wildlife Refuge, it is administered by the U.S. Fish and Wildlife Service. It was established in 1980.The refuge forms the northern part of the Tijuana River National Estuarine Research Reserve, one of 22 National Estuarine Research Reserves created nationwide to enhance scientific and public understanding of estuaries, and thereby contribute to improved estuarine management. It is also part of the San Diego National Wildlife Refuge Complex.

Tijuana River National Estuarine Research Reserve is a natural reserve in Imperial Beach, California and San Ysidro, San Diego. It encompasses the Tijuana River Estuary, located on the Mexico–United States border. It is divided into two parts: the Tijuana Slough National Wildlife Refuge on the north, and Border Field State Park in the south.

The Tijuana River (Spanish: Río Tijuana) is an intermittent river, 120 mi (195 km) long, near the Pacific coast of northern Baja California state in northwestern Mexico and Southern California in the western United States. The river is heavily polluted with raw sewage from the city of Tijuana, Mexico.

Naval Outlying Landing Field (NOLF) Imperial Beach (IATA: NRS, ICAO: KNRS, FAA LID: NRS) is a United States Navy facility for helicopters, situated on 1,204 acres (5 km2) approximately 14 miles (23 km) south of San Diego and within the city limits of Imperial Beach, California. It is known as "The Helicopter Capital of the World".

Friendship Park is a half-acre (0.20 ha) binational park located along the United States-Mexico border in the San Diego–Tijuana region. Located within the larger Border Field State Park in California's San Diego county, the park includes the border fence dividing the two countries where residents of both countries can meet in person. On the U.S. side, the park used to be part of the Monument Mesa picnic area but is now wholly located on federal property under the Department of Homeland Security and is heavily monitored by U.S. Border Patrols 24 hours a day. To the south of this place is the Playas de Tijuana, Baja California. In 2022 the U.S. approved the construction of a wall, but announced soon after plans for the construction had been put on hold. In January 2023, it was announced that construction would proceed.

Border Field State Park is a state park of California, United States, containing beach and coastal habitat on the Mexico–United States border. The park is within the city limits of Imperial Beach in San Diego County, next to the suburb of Playas de Tijuana in Mexico. It contains the southernmost point in the state of California. The refuge forms the southern part of the Tijuana River National Estuarine Research Reserve. Border Field State Park contains International Friendship Park, which is just inland from the place where the border meets the ocean. Immediately adjacent is the monument marking the Initial Point of Boundary Between U.S. and Mexico.

The Initial Point of Boundary Between U.S. and Mexico (Monument No. 258) is the westernmost boundary marker on the international boundary between the United States and Mexico and as such has since its erection marked the southwestern corner of the Continental United States. According to the 1848 Treaty of Guadalupe Hidalgo, the initial border point is set as one marine league (three nautical miles) south of the southernmost point of San Diego Bay, and the border proceeds in a straight line towards the confluence of the Colorado River and Gila River. The significance of the monument is stated in the inscription on the west side of the original marble shaft: "Initial point of Boundary between the United States and Mexico, established by the Joint Commission, 10 October, A.D. 1849, Agreeably to the Treaty dated at the City of Guadalupe, Hidalgo, February 2, A.D. 1848. John B. Weller, U.S. Commissioner. Andrew B. Gray, U.S. Surveyor.

Imperial Beach is a residential beach city in San Diego County, California, with a population of 26,137 at the 2020 United States census, down from 26,324 at the 2010 census. The city is the southernmost city in California and the West Coast of the United States. It is in the South Bay area of San Diego County, 14.1 miles (22.7 km) south of downtown San Diego and 5 miles (8 km) northwest of downtown Tijuana, Mexico.

Mar Vista Senior High (MVH) in Imperial Beach, California, United States, is a high school established in 1951. Mar Vista has an award-winning marine science academy called Poseidon. Students spend grades 9-12 in the academy. It is frequently called "a school within a school." An NJROTC program is also located on campus.

The Plaza Monumental de Tijuana (also called "Plaza Monumental de Playas de Tijuana" after the neighborhood in which it is located), and popularly known in English as the Bullring by the Sea, is a bullring in the city of Tijuana, Baja California, Mexico. It is currently used for bullfighting; the bullring has also been the scene for great boxing matches, concerts, cultural, and sporting events that have benefited the Tijuana community greatly. The stadium holds 21,621 people and its opening was held on June 26, 1960. It is located just 60 meters from the United States border and one block from the Pacific Ocean. The bullring was constructed in only 90 days, resulting from a contract between Salvatore Hurtado, the owner, and Raymundo Muzquiz Ayala. Muzquiz accomplished the construction so quickly by use of pre-fabricated blocks that were made in San Diego and assembled in Tijuana. Bullfights were broadcast in Los Angeles in Spanish during the 1960s and 1970s. Celebrated American bullfighter Sidney Franklin provided commentary in English in the 1960s and by bullfighting expert Syd Love in the 1970s via FM simulcast. The Tijuana Pop Festival was held in the Bullring on 13 October 1968. The festival was slated to feature the Animals, Iron Butterfly, Patchwork Security Blanket, the Collectors, the Chicago Transit Authority and the Yellow Pages; however, the Animals and Iron Butterfly never played. Other issues which marred the event included rumors that the festival had been canceled, long pauses between acts, police activity at the border and at the ring and the political impact of the Tlatelolco massacre only eleven days before. Roger B. Stovold of the Teaspoon Door called the event "one of the biggest fiascos in pop festival history" and concluded that it "left enough of a black mark that any future pop festival in Mexico is unlikely."

The Oasis of Hope Hospital is a clinic in Tijuana, Mexico providing alternative cancer treatments to its customers. The clinic was founded by the physician Ernesto Contreras. After his death in 2003, the management of the hospital was taken over by his son, Francisco Contreras, and nephew, Daniel Kennedy. Since the 1960s, it has administered amygdalin – an ineffective cancer treatment – to its patients. The clinic has been characterized by Quackwatch as "dubious.”

Park Towers by the Sea are a set of four residential highrise buildings in Tijuana, Baja California, Mexico. Located in the Playas de Tijuana area of the city, Park Towers are the first prominent fixtures on the metropolitan Tijuana coastline north of Rosarito Beach. Upon completion of the first tower, the complex became the 10th tallest buildings in the city.