352538
Location Gerishk District sits at the intersection of Highway 1 ( the ' Afghan ring-road ' , based on the old Silk Road and refurbished in the 1960s with US investment ) and the Helmand River .
 Helmand
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Helmand