65751
The most profitable furs in the fur trade were those of sea otters , especially the northern sea otter which inhabited the coastal waters between the Columbia River to the south and Cook Inlet to the north .
 Columbia River, Cook Inlet
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:
 Columbia River, Cook Inlet