Guide books may tell you that a Continental plug adapter will fit many outlets in Nepal.
My experience is that the adapter will fit but that the thin pins sit so loosely in the socket that they don’t establish a reliable connection.
This adapter that I bought in Nepal worked well. I forget how much it cost, but I think it was the equivalent of about $0.70.
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Oh yes, adapters and converters! In reading about Iceland, I will have to get a converter. I think there are combo converter/adapters.
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Iceland uses the standard European ‘Europlug’ socket with two round prongs. We have several of those, but of course they are for a UK plug.
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Yes, when you travel you need them all the time.
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