Aşağıköselerli is a village located in the Akçakale District of Şanlıurfa Province, in the southeastern Anatolia region of Turkey.
As an administrative division, it falls under the jurisdiction of the Akçakale district, which is itself part of the larger Şanlıurfa Province. The region is known for its flat plains and hot climate, typical of the Harran Plain, and agriculture forms the primary economic activity for many settlements.
The name "Aşağıköselerli" is Turkish. The component "Aşağı" translates to "lower," often used to distinguish it from a geographically higher or upstream counterpart (e.g., "Yukarıköselerli" or "Upper Köselerli"). "Köseler" is a plural form that can refer to a specific group, family, or tribal name. The suffix "-li" typically denotes "from" or "belonging to." Thus, the name can be interpreted as "the place of the Lower Köseler" or "Lower Köseler's place," indicating its historical or geographical association with a group named Köseler.