Bolivian Spanish word
los Yungas
Meaning: the Yungas, the warm subtropical valleys below La Paz
How it is used in Bolivia
The green, humid valleys that drop away from the high Andes; Coroico is the classic Yungas town. Bolivians frame the trip as 'bajar' (down to the warm Yungas) versus 'subir' (back up to cold La Paz).
The green subtropical valleys an hour or two below La Paz, where Coroico sits. Warm, humid and remote, which is exactly why you ask about power, signal, nets and cash.
Learn it in a real situation
Explore the Yungas and Bolivian Amazon, Practical Spanish