They likely would have needed to walk roughly 25 to 30 miles to reach a place where they’d have had a realistic chance of encountering someone. The exact distance depends on which direction you measure from their stranded van and what counts as “likely” in that remote part of Death Valley.

Why that range

  • The family’s van was found in an extremely remote area near Anvil Springs Canyon, east of Willow Spring.
  • One widely discussed survival route was south toward the China Lake perimeter, which is roughly in the same broad range that people estimate at about 40 km, or around 25 miles.
  • Because the desert is so sparse, even a few miles can still mean no one at all, so “likely encounter anyone” is a rough human estimate rather than a precise geographic line.

Practical read

  • Less than 10 miles: still very unlikely to meet anyone in that terrain.
  • Around 20–30 miles: starts to become the kind of distance where reaching a road, camp, military boundary, or monitored area could become plausible.
  • Farther than that: survival becomes much less likely without water and shelter in July heat.

Bottom line

A fair answer is about 25 miles, give or take several miles , with the understanding that in Death Valley the difference between “nobody” and “someone” can still be enormous.

TL;DR: roughly 25–30 miles is the best practical estimate for likely encountering someone in that case.