1897
However , the heavy metal residues in the soils of the Upper Harz , which in some cases are significant , represent a serious environmental hazard today .
 location: Upper Harz
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Upper Harz