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Additionally , the United States Army Corps of Engineers maintains of natural surface trails and of equestrian trails within the town limits , most of which are located around Grapevine Lake .
 organization: United States Army Corps of Engineers; location: Grapevine Lake
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:
 organization: United States Army Corps of Engineers; location: Grapevine Lake