Ensenada, Baja California in the context of "Baja California"

Strongylocentrotus purpuratus is a species of sea urchin in the family Strongylocentrotidae, which is commonly known as the purple sea urchin. It lives along the eastern edge of the Pacific Ocean extending from Ensenada, Mexico, to British Columbia, Canada.

After one of its main predators, the sea otter, experienced a population decline, Strongylocentrotus purpuratus became a threat to the health of kelp forests as its own population boomed. The species is also used as a model organism and its genome was the first echinoderm genome to be sequenced.

The 1994 Northridge earthquake affected Greater Los Angeles, California, United States, on January 17, 1994, at 04:30:55 PST. The epicenter of the moment magnitude 6.7 (M_w) blind thrust earthquake was beneath the San Fernando Valley. Lasting approximately 8 seconds and achieving a peak ground acceleration of over 1.7 g, it is the largest recorded earthquake in the area's history, slightly surpassing the M_w 6.6 1971 San Fernando earthquake. Shaking was felt as far away as San Diego, Turlock, Las Vegas, Nevada, Richfield, Utah, Phoenix, Arizona, and Ensenada, Baja California, Mexico. Fifty-seven people died and more than 9,000 were injured. In addition, property damage was estimated to be $13–50 billion, making it among the costliest natural disasters in U.S. history.

The Kumeyaay, also known as 'Iipai-Tiipai or by the historical Spanish name Diegueño, is a tribe of indigenous people who live at the northern border of Baja California in Mexico and the southern border of California in the United States. They are an Indigenous people of California.

The Kumeyaay language belongs to the Yuman–Cochimí language family. The Kumeyaay consist of three related groups, the 'Iipai, Tiipai, and Kamia. The San Diego River loosely divided the 'Iipay and the Tiipai historical homelands, while the Kamia lived in the eastern desert areas. The 'Iipai lived to the north, from Escondido to Lake Henshaw, while the Tiipai lived to the south, in lands including the Laguna Mountains, Ensenada, and Tecate. The Kamia lived to the east in an area that included Mexicali and bordered the Salton Sea.

Guadalupe Island (Spanish: Isla Guadalupe) is a volcanic island located 241 kilometres (130 nautical miles; 150 miles) off the western coast of Mexico's Baja California peninsula and about 400 km (220 nmi; 250 mi) southwest of the city of Ensenada in the state of Baja California, in the Pacific Ocean. The various volcanoes are extinct or dormant. In 2005 Guadalupe Island and its surrounding waters and islets were declared a biosphere reserve to restore its vegetation (decimated by feral goats) and to protect its population of marine mammals and birds. The island was a popular destination for great white shark cage diving before a tourism ban was put in place in 2022. Guadalupe Island is inhabited only by scientists, military personnel operating a weather station, and a small group of seasonal fishermen. The island is mostly arid and has very little surface water.

The two other Mexican island groups in the Pacific Ocean that are not on the continental shelf are the Revillagigedo Islands and Rocas Alijos. Guadalupe Island and its islets are the westernmost region of Mexico.