Hi guys. Thanks for the tips.

I've amended the map after adding a layer for tectonic plates. The very mountainous region to the north of the left hand landmass has been retained, although modified. There are 3 plates pushing together here. This has left me with an area where the plates are moving apart over a landmass (to the south of the landlocked sea on the left landmass). I was considering adding a volcanic region here with a chasm.

Anyway, here it is:

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Cheers

Tyo Solo