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The Saint Lawrence Seaway , which extends across most of the southern portion of the province and connects to the Atlantic Ocean , is the primary water transportation route for cargo , particularly iron ore and grain .
 Saint Lawrence Seaway, Atlantic Ocean
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Saint Lawrence Seaway, Atlantic Ocean