most distant reaches of the island

[Pavel Pin]

Jupiter says about savage, aboriginal dogs:

Jupiter: They were born into captivity on the ends of the fringes of the most distant reaches of the island. They endured great suffering and cruelty at the hands of their former masters.

Why is "of" used instead of "from"?
Source: Isle of Dogs 2018

 

[Keith Bradford]

Reaches = parts or areas. These are parts of the island.

 

[Pavel Pin]

Thank you

 

[entangledbank]

This noun 'reach' is probably only common in this situation: plural and comparative. We also say 'the furthest reaches' of something, but I can't remember seeing just a 'reach' of an island, country, etc.