Lot of clubs close together on that League One map, but I wouldn't class many of them as derbies.

Few rivalries in South Yorkshire by way of proximity, and I believe Bolton/Wigan has become a bit of a derby in recent years. There's also an argument for Bradford/Huddersfield (although if you have to argue it then it's not a proper derby IMO).

But I think the only "recognised" derby would be Exeter/Plymouth?