The two main lowland areas are marked on this map:
The outlines of the lowlands are obvioulsly marked by the convection rolls division lines.
The Reykjanes Ridge uppermost division line does cross the geothermal area of the West, whereas the large geothermally active area of the South is found mainlu within a triangle, north of the South Iceland Seismic Zone (and within it), inside the polygon of the Southern Lowlands.
Magic Magma 