SABAH, Libya, is an oasis town at the northern edge of the Sahara Desert. To stand at the edge of the town and look southward into the desert toward Niger is forbidding. The sand stretches past infinity, and if there is a wind, it lifts the sand to cover the sky.

Cars come down the road past the al-Baraka Mosque into the town. Some of these cars come from Algeria (although the border is often closed) or from Djebel al-Akakus, the mountains that run along the western edge of Libya. Occasionally, a white Toyota truck filled with men from the Sahel region of Africa and from western Africa makes its way into Sabah.

Miraculously, these men have made it across the desert, which is why many of them clamber out of their truck and fall to the ground in desperate prayer. Sabah means “morning” or “promise” in Arabic, which is a fitting word for this town that grips the edge of the massive, growing, and dangerous Sahara.