The Gulf of California xeric scrub covers an area of , lying on the eastern side of the peninsula along the
Gulf of California. The
Peninsular Ranges, including the
Sierra de San Francisco and
Sierra de la Giganta, run the length of the peninsula, separate the Gulf of California xeric scrub from the
Baja California desert on Baja California's Pacific slope. The ecoregion extends from the gulf shore to the crest of the mountains, and includes several of the islands in the gulf, the largest of which are
Isla Ángel de la Guarda,
Isla del Carmen, and
Isla San José. To the north, the Gulf of California xeric scrub transitions to the
Sonoran Desert. At the southern end of the peninsula, the Gulf of California xeric scrub transitions to the
San Lucan xeric scrub. ==Flora==