Thank you worldbuilding pasta, for the advice regarding reprojection. From now on, I'll opt for the Polar Coordinates filter instead of the sphere, and I'll definitely make sure to minimize the steps involved.

I've been working hard on the next continent, whose original dimensions are over 5,000 x 10,000 pixels and wouldn't fit here. Thus, I've resampled the image and included some close up shots below.

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Hope you all enjoy this as much as I've enjoyed rendering it.

Peter