Imperial Beach, California

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.

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".

Silver Strand Training Complex South (SSTC-S), formerly known as the Naval Radio Receiving Facility (NRRF), is the premier training facility for U.S. Special Operations Forces. Located between Imperial Beach and Silver Strand State Beach near San Diego in southern California, USA, this facility was known by locals as the "elephant cage" which is a nickname for the large Wullenweber direction finder antenna. The antenna was used to provide direction finding, primary communication links for U.S. Navy submarines. The antenna was finally dismantled in 2015, even though it was scheduled to be removed in fiscal year 2007. Presently the area is part of Naval Base Coronado and commanded by that base's Commanding Officer. While just north of Imperial Beach, it is within the city limits of Coronado.

Egger Highlands is a residential neighborhood in the southern section of San Diego. It neighbors Palm City and Nestor to the east, San Diego Bay to the north, Imperial Beach to the southwest and Chula Vista to the northeast. Major thoroughfares include Coronado Avenue, Saturn Boulevard, and Palm Avenue.

The Tijuana River Estuary is an intertidal coastal wetland at the mouth of the Tijuana River in San Diego County, California, in the United States bordering Tijuana, Baja California, Mexico. It is the location of the Tijuana River National Estuarine Research Reserve, Tijuana Slough National Wildlife Refuge, Border Field State Park, and Tijuana River Valley Regional Park. The estuary is a shallow water habitat. Often termed an intermittent estuary since its volume is subject to the discharge controlled by the seasons of the year, the volume of the estuary fluctuates and at times there is dry land, or flooded areas. It was designated a National Natural Landmark in 1973.

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.

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.

San Diego National Wildlife Refuge is a National Wildlife Refuge in California. It is part of the San Diego National Wildlife Refuge Complex. A variety of habitats from coastal sage scrub and chaparral to oak woodland and freshwater marsh describe this inland refuge in San Diego's backcountry.The Living Coast Discovery Center is located in the Sweetwater Marsh Unit adjacent to the administrative headquarters for the US Fish & Wildlife Service. The Center features exhibits of marine life, birds and plants found the San Diego Bay, and partners with the Refuge to offer environmental education programs. There are 1.5 miles of trails with access to the Bay. The Otay-Sweetwater Unit of the San Diego National Wildlife Refuge is part of the National Wildlife Refuge System's contribution to the Multiple Species Conservation Plan, a program designed to conserve enough open space and habitat for species survival while enabling orderly development to occur where necessary. It is closed to the public. San Diego National Wildlife Refuge's abundance of coastal sage and chaparral are an important addition to other inland preserves established to conserve and restore fast diminishing habitat. This inland refuge is home to such endangered birds as least Bell's vireo, California gnatcatcher, a rare butterfly, the Quino checkerspot and to the San Diego horned lizard. Biological surveys for other species are ongoing as new land is acquired. The approved refuge boundary for the San Diego Refuge is 44,000 acres (180 km2), and 8,000 acres (32 km2) for the Vernal Pools Unit.

San Diego Bay National Wildlife Refuge is an urban refuge located on San Diego Bay in San Diego County, California. It is part of the San Diego National Wildlife Refuge Complex. It was dedicated in June 1999. The refuge, comprising 316 acres (1.28 km2) of salt marsh and coastal uplands surrounded by urban development, is a critically important area for wildlife because over 90 percent of the historic wetlands of San Diego Bay have been filled in, drained, or diked. Sweetwater Marsh provides habitat for four endangered or threatened species, including light-footed rail. It is also the only place in the United States where yerba reuma, a member of the heath family, grows naturally. More than 200 species of birds have been recorded on the refuge. With 90 to 100% of submerged lands, intertidal mudflats, and salt marshes eliminated in the north and central Bay, the South Bay unit of the refuge will preserve and restore the remaining wetlands, mudflats and eelgrass beds to ensure that the bay's thousands of migrating and resident shorebirds and waterfowl will survive into the next century. The approved refuge boundary is 3,940 acres (15.9 km2).

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.

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.

Rancho Melijo, or Milijo, named after a local Kumeyaay village. It was later called Rancho La Punta for the location of the Arguello family ranch house, on a point of hills overlooking the south end of San Diego Bay, north of the Otay River and east of where the river entered the south bend of the bay. It was a Mexican land grant rancho, granted by Governor José Figueroa in 1833 to Santiago E. Argüello.The rancho covered a square league of land extending 1 league north of the San Antonio Hills and 1 league east of the Pacific Ocean from the mouth of the Tijuana River, including its estuary and the plain east up the lower Tijuan Valley, amounting to 4,439 acres of land. The southern part of the land was adjacent to his fathers Rancho Ti Juan and Rancho San Antonio Abad It extended from the foot of the range of hills that the 1856 county map calls the San Antonio Hills just above the modern border of Mexico, to as far north as to include the south end of the San Diego Bay where the Otay River entered the bay and the southern part of the hills on the north side of the Otay River.With the cession of California to the United States following the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored. As required by the Land Act of 1851, a claim for Rancho Melijo was filed with the Public Land Commission in 1852. The claim (91 SD) with the California Land Commission was rejected and failed in appeals to higher courts. The Argüello family retained some of the land, homesteading it in the vicinity of the ranch house north of the Otay River and by the bay.The Rancho Melijo included all of modern Imperial Beach, part of southwestern Chula Vista and the Tijuana River Valley, Otay Mesa West, Nestor and Palm City, neighborhoods of southern San Diego. The ranch house fell into ruin in the 20th century and was razed to make way for the I-5 freeway.