29006
This river has a steeper gradient and therefore flows more swiftly than the White Nile , which it joins at Khartoum .
 White Nile, Khartoum
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 White Nile, Khartoum