In historical terms, this would be called a colony, but currently this name is no longer used and there are no places actually known as "colonies".
The current political term for this is a "territory": this is the correct answer, one example are the overseas territories of France.
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The Amazon is the world's longest river.
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The top part of the Caliente lava dome collapsed and produced large flows of lava, pyroclastic, and many explosions. It was a very hazardous and dangerous event.
Hope this helps!