Possible Clues:

• Elders no longer keeping motorway limits?
• North and south, e.g.
• At either end from the rivers, by the sound of them
• Fanatics go to these ends
• How the tree is about a thousand in the sex of both ends
• The furthest degrees
• You've gone too far if you've gone beyond these!
• They're poles apart
• Points farthest from the middle
• Highs and lows, e.g