>>1497570Skies of Arcadia (play the GC version with the encounter rate mod)
Grandia 1/2
Final Fantasy 12 (personally the one that felt like a huge world and adventure to me)
Dragon Quest 3 (also same)
Lunar Silver Star
Xenoblade Chronicles
Dragon's Dogma 1/2 (if it counts)
Metal Max Returns (kinda)
Pokémon R/S/E (the one that felt like every location was new and different, might've been a kid thing though, R/B/Y and G/S/C never gave me this feeling despite playing them as a kid too)
Tales of Innocence R (also kinda, felt similar to Lunar)
Threads of Fate (also kinda, fun world but not a huge one)
Paper Mario N64/TTYD
Some non JRPG's:
Solatorobo: Red the Hunter
Fable TLC
Shenmue 1/2 (especially 2)
Ico/The Last Guardian (more exploration and wonder than adventure)
Gravity Rush 1/2 (same as above)
Elden Ring (technically a JRPG but just in case I'll leave it here)
Hope I helped, I try to find that feeling in vidya as well.