You could say, like the backs of their hands. And when we plan trips of our own, they're the first people we talk to.
For Ettanya, that knowledge comes from years in Southeast Asia. She's lived with the community of Luang Prabang, met traditional healers around bubbling cauldrons in Siquijor, and climbed the slopes of Mount Kelimutu, where she sat for "hours in awe".
Over time, she's built a mental map of Southeast Asia that some people might call excessive. But you're not "some people" – and neither are our Travel Experts.