The Osorno–Llanquihue Basin () is a sedimentary basin located in south-central Chile in the forearc region of the Andes. From north to south the basin spans and area from Catamutún to Reloncaví Sound (40–42° S).Elgueta et al. 2000, p. 7. The deepest part of the basin lie to the east.Elgueta et al. 2000, p. 10. The lower levels of the basin are occupied by coal-bearing Cheuquemó Formation among other units while the Miocene-aged marine Santo Domingo Formation makes up much of the upper stratigraphy. The uppermost levels are made of sediments of Quaternary age of glacial, glaci-fluvial, glaci-lacustrine and volcanic character.Elgueta et al. 2000, pp. 13–14. The thickness of Quaternary sediments is greater to the south reaching almost in Puerto Montt. Sediments in the western part of the basin are roughly estimated to have reached during burial and diagenesis.
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