Conchagua consists of two overlapping stratovolcanoes in a single conical edifice. It is located in southeastern El Salvador overlooking the Gulf of Fonseca. Cerro de La Banderas, at 1133 m, appears younger but is dated at 0.41 ± 0.1 Ma. To the west-southwest is the Cerro del Ocotal at 1225 m and dated at 0.15 ± 0.02 Ma. There are active fumarolic areas on both peaks but no recorded history of eruptions.