Upper area of the Loa River and surroundings, showing the location of populations recently assigned to Telmatobius halli, its type locality according to this study and other Telmatobius populations near Ollagüe. The railway line that connected Ollagüe with the Collahuasi mine (to the Montt station) and the dirt road that connected the Collahuasi mine and Chiclla with Miño (white arrows) are indicated. Note that the road continues from Miño to the Carcote salt flat. The background map was constructed by joining two maps published by the Comisión Chilena de Límites in 1912.