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The Coronado Islands (Islas Coronado or Islas Coronados) are a group of four islands off the northwest coast of the Mexican state of Baja California. Battered by the wind and waves, they are largely infertile and uninhabited except for a small military detachment and a few lighthouse keepers. The islands lie between 15 and 19 miles south of the entrance to San Diego bay, but only 8 miles from the Mexican mainland.
The Coronado Islands 
The Coronado Islands are a Mexican wildlife refuge; visitors may anchor, scuba and snorkel, but trips ashore are not allowed.
- North Coronado has no bay but boats can anchor on a jetty on the eastern side.
- Location: 
- Size: 460,000 m² (113.66 acres, 0.18 sq miles)
- Height: 153 m
- Length: 800 m
- Pilón de Azúcar (Pile of Sugar) is very hard to land on. It has little vegetation but there is a flock of birds that rest here.
- Location: 
- Size: 70,000 m² (17.3 acres, 0.03 sq miles)
- Height: 33 m
- Central Coronado has a rocky peak with a heap of cactus and scrubs near the summit.
- Location: 
- Size: 140,000 m² (34.6 acres, 0.05 sq miles)
- Height: 32 m
- South Coronado has the only bay of the islands, called 'Puerto Cueva'. It has a lighthouse on each extreme.
- Location: 
- Size: 1.83 km² (452.2 acres, 0.71 sq miles)
- Height: 220 m
- Length: 3,200 m
- Width: 800 m
Article 7 - the state of Baja California is divided and understood as the following municipalities .... Tijuana.
c) The Municipality of Tijuana is made up of ..... in addition; The Coronado Islands correspond to the jurisdiction of the Municipality of Tijuana, which lie on the extremes of the municipality to the Pacific Ocean.
In September 1542 Juan Rodríguez Cabrillo described them as islas desiertas (desert islands). In 1602 the priest for Sebastián Vizcaíno called them Los Cuatro Coronados (the four crowns) to honour four martyrs. Although they have been called a dozen other names (later fisherman upon seeing floating coffins, ghostly faces and shrouded bodies amid the rocks dubbed them: Old Stone Face, The Sarcophagi, Dead Man's Island, and Corpus Christi) they also have also been provocatively called The Sentries of San Diego Bay even though they belong to Mexico.
In the 1920s and 1930s, during Prohibition in the United States, the cove on the Northeast side of South Coronado Island was used as a meeting place for alcohol smugglers. Since it was the time before radar, and as foggy nights are common, the large number of boats frequently resulted in collisions. There was so much traffic that a famous casino flourished there until well into the Depression. Only the stone foundation remains though the name Smugglers Cove, and more rarely Casino Cove, adorn modern maps.
In May 1943 the U.S. Navy's USS PC-815, commanded by L. Ron Hubbard, conducted unauthorized gunnery exercises involving the shelling of the Coronado Islands, in the belief they were uninhabited and belonged to the United States. Unfortunately for Hubbard, the islands belonged to Mexico and were occupied by the Mexican Coast Guard. The Mexican government complained and Hubbard was relieved of command.
The islands are also a popular location for yellowtail fishing for San Diego fisherman.
Flora and fauna 
There are colonies of birds that nest on the islands and can be spotted in the nearby waters like gulls, pelicans, petrels, and sea ducks. The Coronado Islands have the largest known colony of the rare Xantus's Murrelet.
Ten species of reptiles and amphibians are also found in the islands. The best known is the Coronado rattlesnake (Crotalus oreganus caliginis), which is a smaller subspecies than the one found on the mainland. There is also the Coronado snake, which feeds off birds' eggs, the Coronado lizard, which is found in all four islands, and the tree salamanders which live on the three biggest islands. Plated lizards are found on the south and central islands.
There are two types of mammals in the islands: rabbits and mice. How they reached the islands is currently unknown.
Middle Island is home to small colony of elephant seals.
- Google Earth
- Miller, Russel (1988). Bare-faced Messiah: The True Story of L. Ron Hubbard. New York: Henry Holt. pp. 106–107. ISBN 1-55013-027-7.
- "UCSC graduate student's research leads to environmental victory in Coronado Islands". Ucsc.edu. 2008-12-18. Retrieved 2009-07-25.
- Islas Coronado Mexico Photo Gallery
- Vegetation and Flora of Islas Los Coronados, Baja California, Mexico