Lower California, once a permanent fixture of mainland Mexico, is a thousand-mile-long extensional land mass arching into the Pacific Ocean, that being the fault of San Andreas.

Today it is still safely attached to the southwest corner of the United States and the northwest extremity of Mexico.

A Peninsula-(pé-nin'sé-lé, -syé-) n.
a piece of land almost surrounded by water, and connected with the mainland by an isthmus.
[< L paeninsula <paene almost + insula an island] - pe nin' su lar adj.

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