Tijuana River Valley, San Diego

The Smuggler's Gulch is part of a steep walled canyon about 2 miles (3.2 km) inland of the Pacific Ocean. The canyon crosses the Mexico–United States border, between Tijuana, Baja California, and San Diego, California, and Smuggler's Gulch is the part of the canyon on the US side of the border. It may also be called Cañón del Matadero or Valle Montezuma in Spanish, but these names apply more generally to the whole canyon. Smuggling activities within Smuggler's Gulch have occurred since the 19th century, giving this part of the canyon its name. The gulch is vegetated with coastal sage scrub and is home to threatened and special concern bird species. It has a seasonal stream, and normal flow is diverted for treatment. During the late 19th and early 20th centuries, agriculture occurred in the gulch, but was largely abandoned by the late 20th century. In the late 20th century, the gulch was used by illegal immigrants when crossing from Mexico into the United States, being described as a "prime route" during that period. Beginning in the 1980s, sewage flowing through the gulch entered into the Tijuana River, contributing to water contamination; since then mitigation efforts have been undertaken, but are defeated by rainfall. Since 2009, it has been partially filled and traversed by the Mexico–United States barrier.

Southwest [Senior] High School (SHS), in San Diego, California, United States, is a high school established in 1975. It was built on the site of a small railroad yard owned by the Southern Pacific Railroad along the original San Diego-Tijuana line. It existed until the mid-1930s when the tracks were moved east to the present-day Trolley tracks. Part of the Sweetwater Union High School District, it serves all socioeconomic communities of San Diego (specifically the Nestor community), as well as some students living in Chula Vista, Imperial Beach and San Ysidro. The school serves approximately 1,750 students.

Goat Canyon (Spanish: Cañón de los Laureles) also known as Cañón de los Laureles, begins in Tijuana, Mexico, and ends in the United States just north of the Mexico–U.S. border. The canyon is formed by Goat Canyon Creek, which receives water and other runoff from areas south of the border. Most of the canyon and its watershed lies within Baja California.The canyon originated during the Quaternary period; it is bordered by Bunker Hill to its west and Spooner's Mesa to its east. Part of the canyon contains coastal salt marshland and supports numerous sensitive and endangered species.Human activity in and around the canyon pre-dates European colonization; it was part of a route used by the Portolá expedition to San Diego Bay and later formed part of the Missionary Road, which was abandoned in the late 19th century. Farms existed in and around Goat Canyon until the area came under the control of the federal government of the United States. Development south of the Tijuana-Ensenada scenic highway began in the late 20th century, causing sewage to flow northward, a problem that persisted into the 21st century.

Nestor is a residential neighborhood in the southern section of San Diego, and part of the Otay Mesa-Nestor community planning area. It neighbors Palm City and Otay Mesa West to the east, Egger Highlands to the north, San Ysidro to the southeast and the Tijuana River Valley to the south. Major thoroughfares include Coronado Avenue, Saturn Boulevard, Hollister Street, and Tocayo Avenue.

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".

The International Wastewater Treatment Plant (IWTP) is a plant developed by the International Boundary and Water Commission (IBWC) in the South Bay area of San Diego, California. Construction began on a 75-acre site, west of San Ysidro in the Tijuana River Valley. The project, authorized by the U.S. Congress in 1989 and formally agreed between the two countries in July 1990, was part of a regional approach to solve long-standing problems, particularly the flow of sewage-contaminated water into the ocean via the Tijuana River.Completed in spring 1997, the official ribbon-cutting ceremony took place on April 18 and the plant came properly on-line in May. The International Wastewater Treatment Plant was created in an effort to mitigate pollution caused by untreated sewage coming from the city of Tijuana. The U.S. paid for the majority of the treatment plant, citing the sewage runoff as an international issue. It required the cooperation of multiple governmental bodies. Even though most of the plant's raw sewage comes from Tijuana, it is owned by the U.S. portion of the International Boundary and Water Commission, an agreement between Mexico and the US that helps delineate border lines and allocate water flow from the rivers and other bodies of water that intermingle between the U.S. and Mexico.Due to the rapid growth Tijuana has experienced, failures of the sewer infrastructure were frequent. Mexico did not have the money to fund a large treatment plant to deal with this issue, so the U.S., specifically the Environmental Protection Agency (EPA), helped to fund the project. The rationale for this was that due to the proximity of Tijuana to San Diego, and the fact that the sewage flow often causes the closure of U.S. beaches due to bacterial contamination of the water, it was warranted for both municipalities and government bodies to contribute to funding. The project cost the U.S. a total of $239 million initially, and the addition of secondary treatment technology that helped meet regulations so the water could flow to the U.S. side of the border cost an additional $18 million. Currently, the treatment plant supports a daily flow of 25 million gallons of raw sewage per day. Ultimately, this agreement made strides to increase the availability of clean drinking water in Tijuana and helped to ensure that pollution and degradation to the surrounding environment was minimized.

Iris Avenue station is a station on the Blue Line of the San Diego Trolley in the Otay Mesa West neighborhood of San Diego. The stop serves a variety of purposes, holding the function of commuter center with a park and ride lot and to provide access to the nearby commercial and residential areas.

Camp Lawrence J. Hearn was a United States Army facility formerly located in Palm City, San Diego, California. The Third Oregon Infantry established the camp in 1916 during its border service; it was abandoned in 1931 by the 11th Cavalry Regiment when the regiment moved to the Presidio of Monterey.

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.

Palm Avenue station is a station on the Blue Line of the San Diego Trolley located in the Palm City neighborhood of San Diego. The stop serves a variety of purposes, holding the function of commuter center with a park and ride lot and providing access to the nearby commercial and residential areas.

Ibero College Tijuana, opened in 1982, is a Jesuit middle and high school on the campus of Ibero-American University Tijuana in Playas de Tijuana, Tijuana, Mexico.

Colegio Ingles Internacional Highland Prince Academy de Mexico, A.C. is a group of schools located in the borough of Playas de Tijuana, in Tijuana, Mexico. It consists of four schools: HPA Jardin de niños HPA Primaria HPA Secundaria HPA Preparatoria The HPA group is one of the oldest schools of the city of Tijuana, founded in 1971.