Abstract
Thingvallavatn occupies a NE-SW elongated graben within the western branch of the axial rift zone in SW-Iceland. The topography of the graben floor slopes off from the Langjokull ice cap and Skjaldbreidur lava shnumield of over 1000 m altitude in the NE to below sea level in the southwestern part of the lake. The bedrock of the catchment consists of 1) Postglacial lavas that are most extensive in the central part of the graben. 2) Upper Pleistocene pillow lava and hyaloclastite of subglacial origin and subaerial inter- or supraglacial lava
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