Here is an area in eastern germany with lot's of opencast mining in the past (much bigger than what RWE did) - the lakes are former mines but there are some ser

Here is an area in eastern germany with lot's of opencast mining in the past (much bigger than what RWE did) - the lakes are former mines but there are some serious problems especially regarding quality of water and water levels https://goo.gl/maps/2r1ZhDMHZVHf21ug8 https://goo.gl/maps/2r1ZhDMHZVHf21ug8