[3][4] Machuelo Abajo is an urban barrio located in the southern section of the municipality, in the northeast portion of the city of Ponce, within the Ponce city limits, at latitude 18.024217 N, and longitude -66.600217 W.[5] Machuelo Abajo is bounded on the North by Tito Castro Avenue/PR-14 (roughly), on the South by Miguel Pou Boulevard (roughly), and Abaisin Street, on the West by Rio Portugues, and on the East by Los Negrones Hill, Rio Bucana, and Emilio Fagot Street (roughly).

[6][7] In terms of barrio-to-barrio boundaries, Machuelo Abajo is bounded in the North by Machuelo Arriba, in the South by San Anton and Sabanetas, in the West by Quinto and Sexto, and in the East by Sabanetas.

[8] In addition the communities of Residencial Dr. Pila, Villa Esperanza, and Valle Verde, make their home there as well.

[11] The highest point in Barrio Machuelo Abajo is Cerro Los Negrones at 397 feet, located northwest of Mercedita Airport.

Río Bucaná runs a stretch of its course (channelized) through barrio Machuelo Abajo.