In any country or region, the block of repeater input frequencies will be distinct from repeater output frequencies. As you can't change the output frequency of a repeater, it will never just be captured by the input of another repeater.
For example in the USA, on 2 metres, there's a 600 kHz split and the freqencies are allocated like this: (from here)
It is possible to link repeaters together to extend their coverage. This can be done by listening to each other's output, with dedicated links between repeaters (at 70 cm or above) or using phone lines or the internet.
One example I'm aware of is the Cape Linked Repeater Network which interconnects more than 20 wide-area repeaters along 1000 km of coastline.
The links can be broken by DTMF tones, so the repeaters can be used normally for long chats or club events, and then reconnected at quiet times to allow travellers access to the whole network.
There seems to be a similar network across eastern Manitoba and Western Ontario.