Zunhua (China) is 15 times larger than Carlsbad, California.
Area: 100 km2 calculated
Carlsbad is an affluent seaside resort city occupying a 7-mile stretch of Pacific coastline in North San Diego County, California. The city is located 87 miles south of Los Angeles and 35 miles north of downtown San Diego. Wikipedia
Area: 1,498 km2 calculated
Zunhua is a county-level city under the administration of Tangshan, Hebei, China. Historic sites include the Eastern Qing Tombs. Wikipedia