48067
While measurements vary somewhat , the lowest points are along the lake shore at , while the highest point , at , is the morainal ridge of Blue Island in the city 's far south side .
 Blue Island
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Blue Island