Classify the cities based on whether they are located in Eritrea or Gabon.
Keren, Franceville, Asmara, Port-Gentil, Assab, Libreville
Eritrea - Asmara, Keren, Assab
Gabon - Libreville, Port-Gentil, Franceville
Instruction: Classify the cities based on whether they are located in Eritrea or Gabon.
Keren, Franceville, Asmara, Port-Gentil, Assab, Libreville
Context: 
Response: Eritrea - Asmara, Keren, Assab
Gabon - Libreville, Port-Gentil, Franceville