Most homes now in panama are made out of cement, but not that long ago they were made of mud over a framework of sticks. These barrios were usually made during the “Junta”, where the community would gather and work, mixing mud and straw and building up the walls. Here is a barrio wall up close.
The mud in panama is very dense and hardens close to concrete. This here sounds like cement when you tap on it.
Saludos from 7.35 Degrees North