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xkcd #3121: Kite Incident
(imgs.xkcd.com)
Title text:
Detectives say the key to tracking down the source of the kites was a large wall map covered in thumbtacks and string. 'It's the first time that method has ever actually worked,' said a spokesperson.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3121/
I think OP means it's above on a map, i.e. north, like how the Mediterranean is above Africa.