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It then runs near the southern margin of the national park via Trefil and the Llangattock escarpment to Blorenge where it turns southwards .
 Trefil, Llangattock, Blorenge
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Trefil, Llangattock, Blorenge