Ontario is a city located in south west San Bernardino County, California, United States, 35 miles east of downtown Los Angeles. Located in the western part of the Inland Empire region, it lies just east of the Los Angeles county line and is part of the Greater Los Angeles Area. Wikipedia

Yanshi is a county-level city administered by the prefecture-level city of Luoyang in western Henan province in the People's Republic of China. Yanshi lies on the Luo River. Erlitou, the main site of the eponymous culture, was discovered here in 1959. Wikipedia