First off, let me say, I love the series, love the various planets, but there is one error (and it is a huge one) that is scientifically impossible that every product to date has had.
That error is the rivers. Every world published to date in the Touring the Stars has at least one river somewhere on it's surface that has split and flowed out to sea on two different tributaries, on some of these planets these splits end up emptying into the ocean thousands of kilometers apart from each other.
As someone who has done a lot of fantasy world mapping, and was a member of The Cartographer's Guild, this is an error we have seen time and again, and one that a lot of us have made (I have done it in the past myself).
This is not to say, a river cannot form a Delta like the Nile River, or even what I have in my Home City of Vancouver the Fraser River Delta. But one will never see a river split thousands of Miles upstream to then empty into the ocean as two separate rivers.
And on the same page as rivers don’t split off except in Deltas, lakes may have many rivers and creeks flowing into them, but ultimately, only one river will flow out.
So, please, think of a River as a Tree, the smaller branches (the Creeks and lesser rivers) eventually join into the larger branches and then to the trunk (the main river) that eventually ends at the ground (the Ocean).