Groundwater level, temperature, and sometimes electro-conductivity (EC) in two aquifers - Hourly automatic data, 11 boreholes Spreadsheet describing the groundwater observation network. Map localising the 18 boreholes and 10 springs (2 textfiles, 6Ko): 14 boreholes selected among the abandoned ones, and 4 new ones drilled downstream of Fláajökull, on a line toward the coast (FLA1, FLA2, FLA3, FLA4). The network thus constitutes of 13 boreholes in the basalt formation and 5 in the till and glacio-fluvial formation. In addition, we monitored 10 depression springs, 4 from the basalt aquifer and 7 from the till and glacio-fluvial deposits aquifer. All boreholes and springs were localised using a differential GPS in September 2021. Monitoring of 4 boreholes in the till and glacio-fluvial deposits and 7 boreholes in the basalt using automatic pressure and temperature probes, at an hourly time step (6 TD-Diver type DI802, 3 TD Micro-Diver type DI501) and 2 probes measuring in addition electro-conductivity (2 CTD-Diver type DI217). To correct for the atmospheric pressure we used 3 Baro Diver type DI800 and 1 Baro Micro-Diver DI500. One spreadsheet per borehole, giving groundwater level (m asl) and temperature (total 3.5Mo): ASK102 period from 10 Nov 2021 to 13 July 2022 and 17 July to 19 Sep 2022 ASK103 period from 16 May to 19 Sep 2022 ASK104 period from 17 March 2022 to 21 Sep 2022; in addition EC (microS/cm) ASK105 period from 15 Sep 2021 to 21 Sep 2022 FLA1 period from 16 Mar to 21 Sep 2022 FLA2 period from 10 Nov 2021 to 21 Sep 2022 FLA3 period from 24 Aug 2021 to 21 Sep 2022 FLA4 period from 24 Aug 2021 to 12 Jul 2022 HA12 period from 17 May to 22 Sep 2022 HA13 period from 17 Mar to 22 Sep 2022 HA16 period from 17 May to 22 Sep 2022; in addition EC (microS/cm) Origin: MSCA Project Number: 885891 Project Acronym: IceAq Project title: Proglacial and subglacial aquifers: their evolution under climate change and the potential impacts in terms of resources and natural hazards, through the case of eastern Iceland Period of data collection: from May 2021 to September 2022, precise periods specified for each file. Area of data collection: Iceland, south-east of Vatnajökull, Suðursveit and Mýrar. Accessibility: The data can be read using e.g. the following open source softwares: LibreOffice (https://www.libreoffice.org), QGIS (https://qgis.org).