Not the Most Ideal Place to Take a Leisurely Stroll

There were two major things that caught me off guard while reading this text. The first is that I was pleasantly surprised to find Milton's use of calling on the Muses to help write this ("Sing Heav'nly Muse"). It's very reminiscent of Ancient Greek epic poetry, and to me, it signified that there would be trials and tribulations waiting for these characters. The second is that Satan is apparently the size of Classical Greek Titans and Giants??? I had always imagined him as being a bit bigger than the average sized human (maybe like 9 foot tall, max), but I suppose now I know where the whole depiction of Satan being a terrifyingly ginormous guy came from. I think that the most confusing thing about this is the setting? It sounds like Satan and Beezebub are floating in a fiery lake, but then all the other fallen are in a fiery lake as well? Did I read that right? Is it the same lake or are there a bunch of fiery lakes in Hell? Also, are the rest of the fallen as big as Satan or are they minis?

Look at this big fuck-off Satan!
Image from the movie, This is the End.
https://vignette2.wikia.nocookie.net/villains/images/2/2c/This_%21isit11led.jpg/revision/latest?cb=20160222053237