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Water flows northward from the lake via the Slave River and Mackenzie River systems , eventually reaching the Arctic Ocean .
 location: Slave River; location: Mackenzie River; location: Arctic Ocean
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Slave River, Mackenzie River, Arctic Ocean 
Answer:
 location: Slave River; location: Mackenzie River; location: Arctic Ocean