instruction:
Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.
question:
regent's canal is a canal in england.
answer:
regent's canal


question:
the castle of almansa is a castle in almansa, spain.
answer:
castle of almansa


question:
the atacama desert is a desert.
answer:

atacama desert