original_query: What are double placenames and how are they formed?
query: What are double placenames and how are they formed?
answer: Double placenames are names that prominently feature the placenames of two or more constituent geopolitical entities. They are often created when two cities, provinces, or territories are amalgamated or merged, and a decision is made to preserve the old names in a combined form rather than creating a new name. This is often done to respect local sensitivities.