Maybe a little old-fashioned (the first book was written in the 60’s), but I love Jack Vance’s Gaean Reach setting. Thousands of worlds with each of them containing a multitude of civilizations, each of those with their own strange customs. Some of them advanced, others medieval and some of them almost completely alien.
For me it is one of the best universes when it comes to exploration and experiencing new worlds.
Most books, including the ten book series, are by Steven Erickson. There are several other books by Ian C. Esselmont. Read them in publication order regardless of author.
I really love the continent Zammonien from the books by Walter Moers, like “The 13½ Lives of Captain Bluebear”. Just to give you an idea: In one life bluebear goes to nightschool - a school in a mountain lead and taught by an Professor Dr Nachtigaller, who has 7 brains - together with a moutain demon (kind of) and a prince from the 2364. dimension (where everything is made of carpet and people make music on instruments made out of milk) named Qwert Yuiop. Later bluebear gets to the sweet desert, which isn’t filled with sand but with sugar. For the nomadic people of the sweet desert he catches the half-stable fatamorgana City “Anagrom Ataf” in a big pool of molten sugar. You get it. Bluebear being the kings of lairs at one point in the book really fits.
Moers wrote multiple books about that continent. I really love them. I just organized a big station based game about that for my local scouts troop. About 60 kids from 7 to 16 years following my story to rescue Zammonien. Easily dumped 150h of work in that game, but it was really great
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