9848
Its northern terminus was at the village of Sennybridge in the Usk Valley whilst its southern ends lay at Abercraf and Ystradgynlais in the upper Swansea Valley some 20 km to the south .
 location: Sennybridge; location: Abercraf; location: Ystradgynlais
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: Sennybridge; location: Abercraf; location: Ystradgynlais