Santa Barbara Channel, Strait between mainland California and Channel Islands, United States.
The Santa Barbara Channel is a strait separating mainland California from the Northern Channel Islands. The waterway stretches roughly 130 kilometers from east to west with an average width of about 45 kilometers.
During the last ice age, the four northern islands formed a single landmass called Santa Rosae. This connected land lay just 8 kilometers from the California coast before rising ocean levels separated the islands.
The Chumash people built settlements on both coastlines and used the waters to trade and travel between the islands and mainland. These connections shaped how communities lived and interacted across the channel for generations.
Large cargo vessels and tankers travel through established shipping lanes heading to Los Angeles and Long Beach ports. People exploring the region should know that heavy vessel traffic is common and the waters are in constant use.
At Coal Oil Point, natural petroleum seepages emerge from the seafloor. Each day, roughly 40 tons of oil rise naturally into the water, making it a rare location where large-scale natural oil seepage is visible.
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