iOS: 

  1. Tap the entry in the Timeline
  2. Tap the map at the bottom or the date at the top (see Metadata)
  3. Tap the location line in the metadata window. 
  4. Tap "Remove Location" under the map. 

Mac

  1. Open the entry
  2. Click the location pin at the bottom
  3. Click the blue X at the top left of the map. 

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