California emergency workers found a second missing hiker Thursday, a day after her companion was rescued and four days after they got lost while hiking on Easter Sunday.

A massive ground and air search had been launched to find Nicholas Cendoya, 19, and 18-year-old Kyndall Jack in Trabuco Canyon, 55 miles (90 kilometers) southeast of Los Angeles.

Cendoya was found late Wednesday, "severely dehydrated and disoriented," about half an hour from where the pair had parked their car, according to Orange County sheriff's spokesman Lieutenant Jason Park.

Rescue workers continued the search, and Jack was found early Thursday. It appeared the two had become separated on Sunday evening, for an unexplained reason.

Hikers regularly get lost in the mountains and national parks of southern California, with dehydration from year-round warm temperatures a major risk -- although slightly less so at this time of year, before the main summer heat.