I never caught the Catfish on either my Forest or Hill-Top Farms. I'm guessing (?) that it's not accessible from Riverlands either. My best Catfish odds have always been
snoozing next to, ehm... Fishing! in the little Pond in the Secret Woods. It's not
ridiculously far away and I really should be gathering some Hardwood for the Stable and Foraging the rarer items from there. This is my compromise for needing to go all the way out there as I want Hardwood for that
HORSE!
So I can get everywhere
faster. Which leaves more time for naps.
Ah yes, Hilltop. It was legit a fun challenge and then it
sooo wasn't. If you ever want to edit your Hilltop farm save, you can do so (if you're on PC/Mac, maybe Android) and if you plan it right (I eeeeeeventuuallyyyy.... did), you can recover to a reasonably normal-looking Farm. Ehhh, with a few annoying bush placements left over from Hilltop: