Valley of Fire State Park is a region in Nevada with many red sandstone formations. The sunlight reflecting off said formations is where the valley gets its name.
On one of their breaks, Optimus Prime took Team Prime and the kids to Valley of Fire State Park for some downtime. Raf brushed up on the park beforehand with information from the guidebook and impressed the others with his knowledge of the place. Miko was more interested in asking Optimus to relate a story from the war on Cybertron and Prime told them the story of one particular skirmish with Megatron.