the gulf of California, in Mexico, is in baja California (lower California)
Baja California.
The Baja California peninsula.
No, it's part of Mexico not California. I say that because it's right beside Baja California (which is part of Mexico), and also the Gulf of California is right beside Mexico.
The Gulf of California separates the Baja California Peninsula from most of the rest of Mexico. Note that the peninsula is NOT part of the US state of California. It is part of Mexico.
The Gulf of California is the largest gulf off Mexico's western coast. It is formed by Mexico and the Baja Peninsula.
Gulf of California is a place in North America. It is an inlet of sea-water between the Mexican Peninsula of Baja California and the Mexican Mainland. See the linked Wikipedia page for more information.
Right. See related questions.
Baja California is the thin but long peninsula on northwestern Mexico, protruding from southern California. The Isthmus of Tehuantepec is the thinnest region in Mexico, separating the Gulf of Mexico and the Pacific Ocean.
Matamoros is a Mexican city close the Gulf of Mexico and bordering the Texan city of Brownsville. Mexico controls Baja California.
Mexicali IS in Baja California. Actually, such city is the capital of the Baja California state. If you mean what body of water is between Baja California and the Mexican mainland, that would be the Sea of Cortes or Gulf of California. See related questions for further detail.
The Pacific Ocean is to the west. However, the Gulf of California is between the Mexican mainland and the Baja Peninsula. To the east is the Gulf of Mexico and the Caribbean Sea which both lead into the Atlantic Ocean.