Fig. 1

Distribution of groundwater quality sampling points in the study area. The map was created via ArcGIS 10.8.1 (https://www.esri.com/en-us/arcgis/products/arcgis-desktop/resources) based on the standard map No. GS(2019)1822 from the Standard Map Service of the Ministry of Natural Resources ( http://211.159.153.75/ ). No modiffcations were made to the base map.