The calculation of the received energy is important to determine the interference for systems in frontier zones. The Amazonian region is a tropical rain forest, which propagation impairments are vaguely studied. Measured data concludes that in this region, the traditional propagation models like long-range and vegetation, do not explain the received power. This paper introduces a new propagation path loss model specific for the Amazonian region which includes the long range and foliage impact over the model, based in empirical data collected from the Colombian-Brazil border. Results show that the Amazonian region model obeys the behaviour on tropical forest where lateral wave mechanism predominates over direct-wave or ground-reflected one.