California, officially the State of California, is a state in the western part of the United States. It is the third largest state by total area and the largest by population in the United States. Its largest cities are Los Angeles, San Diego, San Jose, and San Francisco. The capital is Sacramento. It is bordered by Arizona to the southeast, Oregon to the north, Nevada to the east and the Mexican state of Baja California to the south.

Vietnam is a country in Southeast Asia and the easternmost country on the Indochinese Peninsula. Vietnam shares its land borders with China to the north, and Laos and Cambodia to the west. It shares its maritime borders with Thailand through the Gulf of Thailand, and the Philippines, Indonesia and Malaysia through the South China Sea.