107761
In 2004 , 19 northern snakeheads were captured in the Potomac River , and they were later confirmed to have become established ( i.e. , they were breeding ) .
 location: Potomac River
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: Potomac River 
Answer:
 location: Potomac River