91379
They are a magnificent group of caves that are only accessible by boat , about two hours upstream from the center of Luang Prabang , and have recently become more well known and frequented by tourists .
 Luang Prabang
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Luang Prabang