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Cutthroat trout co-exist with lake trout in Heart Lake , an isolated back-country lake at the head of the Heart River that gets little angling pressure .
 Heart Lake, Heart River
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:
 Heart Lake, Heart River