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Interstate 8 (abbreviated I-8) is an Interstate highway in the southwestern United States. It runs from the southern edge of Mission Bay at Sunset Cliffs Blvd. in San Diego, California, almost at the Pacific Ocean, to the junction with Interstate 10, just southeast of Casa Grande, Arizona. In California, especially from eastern San Diego County to points east, Interstate 8 runs very close to the United States-Mexico border. At points in eastern Imperial County, the border is no more than two miles (3 km) south of the Interstate.
I-8 within the Mountain Springs/In Ko Pah grade has one of the widest medians on the entire Interstate highway system. In places, the median is over 1.5 miles wide.