18204
With an average altitude of , much of Hyderabad is situated on hilly terrain around artificial lakes , including the Hussain Sagar lake , predating the city 's founding , in the north of the city centre .
 Hyderabad, Hussain Sagar
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hyderabad, Hussain Sagar