1821
During his tenure , he served most prominently as Ambassador to China during the Triple Intervention and negotiation for the lease of Port Arthur ; as Ambassador to the United States for seven tumultuous years which saw the Spanish-American and Russo-Japanese wars ; and as Ambassador to Spain during the Algeciras Conference .
 location: Port Arthur
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Port Arthur