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What are data Island.
From time to time, you may want to load data that is a separate table, disconnected from any other field in your data model. This is called a data island.
Data islands can be created from any data source and are often created as an inline table.
Data islands can be used to reference dates, table headers, or whatever you need to be disconnected from most of the existing data in the data model.
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Data Island are data which are not connected to the model
So you can store data in an island table and use it with Set Analysis
Check This also....
Conditional Queries with Data Islands
Here Island Country and Island Date are Data Islands...