221539
Canadian claims to the islands were affirmed in the Alaska Boundary Settlement of 1903 , in which Tongass Passage , Pearse Canal and the Portland Canal were defined as comprising " Portland Channel " , a term first used in the Anglo-Russian Treaty of 1825 as part of the marine boundary between Russian America and British claims in the region , but which remained undefined until the boundary settlement .
 location: Alaska
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Alaska 
Answer:
 location: Alaska