Here is a questionable quality PNG of a fractral terrain map that I exported to CC3+. I like land-locked or nearly land-locked seas and oceans because of the critical locations they create. It is is the same with any natural barriers: rivers, deserts, mountains, etc. While my world is more segregated than it appears with the text labels, I did want a sense of the power centers or at least places of origins for the races in my world. I like to imagine how land formations impact history: migrations, invasions, wars, trade, etc.