A cross made of stones is serving as a makeshift memorial for Gabby Petito in Wyoming … on the exact site where cops believe they found the missing 22-year-old’s body.

As we reported, the feds announced Sunday they’d found the remains of a young woman at the Spread Creek Dispersed Camping Area in the Bridger-Teton National Forest … where the van used by Gabby and her boyfriend, Brian Laundrie, was spotted days earlier.

An autopsy is scheduled Tuesday to confirm the body is Gabby’s, but the stone cross memorial is already set up right where investigators searched for her in Spread Creek.

As you know … Gabby’s story became national news when Laundrie showed up back at his Florida home without her on Sept. 1, even though they had taken the cross-country trip together and were documenting it on social media.

However, Gabby’s family claims they lost touch with her in late August and Brian allegedly refused to give them any info on her location or what happened between them.

The family reported her missing on Sept. 11, and Laundrie was named a “person of interest” but never arrested.

Shortly after that, it was revealed the couple had a domestic dispute in Utah on Aug. 12, and even though a 911 caller alleged Brian slapped Gabby … an official police account of this entire incident reportedly claimed “no one reported that the male struck the female.”

Nevertheless, the couple was eventually released with no arrests in mid-August, and Gabby went missing sometime after that … though it’s still unclear exactly when.

Laundrie may have the answers, but after being named a person of interest, he also went missing over the weekend and cops are now on the hunt for him. The authorities have also been at his family home in Florida for days, and have removed boxes of evidence.