This has only started happening since the Enheduanna Update.

My maps are always almost entirely land, with two thin strips of water at the north and south.

I didn't report it as a bug because my friend plays too and doesn't have this issue.

Am I just not noticing something in my world settings?

These are my settings:

And the rest of the settings:

Are you changing the map seed?

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Duamatef wrote:

Are you changing the map seed?

It's set to "random if empty" - I've never used a map seed

I've found the solution, for anyone else who may need it:

World Shape being set to "Random" can give Pangea, Large Pangea and No Ocean as 3 of the 6 options. 

That's a 50% chance of having one of those maps I described in the original post.

I guess I just rolled that 50% 8 times in a row, which was quite unlikely!

I've noticed it seems to weight the "random" seed to be about the same every time myself.