The Ethics of Writing About People You Met Abroad

There is a moment in every travel memoirist's life when you realize that the kindest person on your trip — the one who took you in, fed you, translated for you, and asked for nothing — is about to become a character in your book, and you have not asked them. This is the ethical knot at the center of the genre, and it does not untie itself.
Some writers solve it by changing names and details. That helps with privacy, but it does not address the deeper question: do you have the right to tell someone else's story? The honest answer is that you have the right to tell your own story, which necessarily includes the people who passed through it. But the further you move from your own experience into theirs — their family, their past, their secrets — the more care you owe.
What consent actually looks like on the road
Asking permission is not always possible. You meet someone on a bus, you share a story, you never see them again. In those cases, the standard is not consent but restraint: write what you witnessed, not what you inferred. If you are guessing at their motives, their history, or their inner life, you are writing fiction and calling it memoir, and the person on the page is no longer them.
When you do have a relationship — a host family, a guide, a friend you have stayed in touch with — the better move is to ask, and to ask specifically. "I want to write about the week I stayed with you. May I describe your home, your mother, and the argument we had about the election?" Vague permission ("sure, write about me") is not permission for everything. Specific permission respects the person and also protects you from the unpleasant surprise of an email months later.
There is a third category, harder to name: the people you write about because writing about them is the only way to understand what happened to you. The person who hurt you. The person who failed you. Here, the ethics are murkier. Many memoirists write anyway, then change identifying details enough that the person would recognize themselves but a stranger would not. It is not a perfect solution. It is a workable one.
When the story is not yours to tell
Some stories belong to the people who lived them, and your role in the story is to be a witness, not a narrator. If a friend tells you about a childhood you did not witness, in confidence, over tea in a village you will never return to, that story is not material. It is a gift. Treat it like one.
The test is not whether you can write it. It is whether the person would be okay reading it. If you cannot imagine handing them the page, you already know the answer. Put it in the drawer, or put it in fiction, or find a way to tell the story that does not require you to stand on their shoulders.
Travel writing is often described as a genre of encounter. That is true. But encounter is not the same as extraction. The best travel memoirists are the ones who remember that the places and people they write about are not backdrop. They are the point. Write accordingly.