How about splitting up the ‘Eastern Ocean’ into ‘Central Ocean’ and ‘Eastern Ocean’? The continent on which the ‘Eastern’ part is written on acts very much like a dividing point – biomes are largely different too.

Also, bit nit-picky this, but rather than naming the seas/oceans after generic names such as ‘central ocean’, how about you come up with completely new names? Try looking at some latin/fantasy names, see if something takes your fancy 🙂 – or, how about naming them after stars? Naval navigation uses the stars after all, and some have beautiful names (Altair, Vega)

Also super last nit-picky thing, as opposed to naming it ‘Verussian Sea’ (it is a beautiful name, don’t get me wrong), it is quite political… and as you said people will likely disregard it or change the name with time. How about the leaders of VE decide on a neutral name for the sea? That way it’s not political.

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A few super small named regions:

• The bottom ‘tip’ of the Southern Ocean that touches the border has a wall around it – and can be considered it’s own region. TAS, with some CLTN and SHREK members dominate that area, maybe they could think of a name together?
• What BGraph said

People may also want to name some straits or passages – these are small bodies of water connecting two larger bodies of water