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From its headwaters near Interstate 81 , the river flows southeast through several water gap s in the Ridge-and-Valley Appalachians , ending at its confluence with the Schuylkill River in Schuylkill Haven .
 Schuylkill, Schuylkill Haven
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Schuylkill, Schuylkill Haven