Thinking about it and from what i have,
Nektar's Journey to The Centre of The Eye and
A Tab in The Ocean might satisfy your criteria.
There's also a band named
High Tide who have quite a few similarities, but all i have is a compilation and haven't listened to any actual album of theirs.
I still need to dig more deeper.
YouTube - Nektar - prelude_astronauts nightmare (Just one song from Journey to The Centre of The Eye)
YouTube - High Tide "Futilist's Lament"
YouTube - High Tide _ Pushed, But Not Forgotten _ Sea Shanties