cursed I only have 300 hours in MHW, but I disagree with mogwaimon-san. I'm not sure I would say that MHW has nothing to do with exploration. Sure it's no Gothic or Outward or whatever, and there is no unique loot to find per say, but the exploration element is there and it is fleshed out enough to compliment the main features of the game.
For one, the aforementioned regions where you hunt monsters are fuck-huge, and are unmapped when you first encounter a region. So initially the exploration element is indeed very strong, as you gradually discover each individual zone making up the whole map, some of which require a fair bit of perception and some concealed paths to get through. Sometimes I would discover nooks and crannies of maps unnoticed by me despite dozens of hours of playing a single map. Careful exploration will reward you in finding spots for additional camp-sites and spawn points around the map, some of which are likewise out of plain view.
Then, this knowledge of the map is constantly tested. While you can always simply follow monster tracks and your scout-flies, having a good sense of direction and which route to take in order to cut-through some obstacles, chase or evade a monster, or lead your quarry into a natural trap or advantageous terrain will be essential. Beyond combat, you will be gathering a ton of materials in every region, and having an idea of where the resources you are looking for are so that you can cut efficient paths through the level is always very beneficial.
Afterwards, even after you become comfortable with the maps and know your way around, each lang has a set of side-quests that will have you find treasures of the local kitty-tribes in order to level up your relations with them and get miscellaneous trinkets. You will get various riddles and will have to decipher them to figure out which of the many landmarks you have traversed bear hidden treasure.
Finally, with the DLC, you not only get an entirely new region and twice the aforementioned meow-meow UwU-chan riddles across every region in the game, but an entirely new set of exploration objectives that entails you going around regions snapping pictures of specific critters and events for more rewards.
This is not to mention that you can collect little critter dudes, like cute bugs and bunnies and shit like that, some of which are quite elusive and will require you to pay a lot of attention to the game's lush environments. Then you get to stick all them little motherfuckers in your house and gawk at them for your trouble. I found the super rare ancient forest songbird by sheer accident, what rings you got bitch??
In short, MHW may not have the exploration of your average RPG, but I would confidently say the game has a pretty decent secondary focus on it and provides exploration-related content through all stages of the game. Don't buy MGW for the exploration alone, but if you enjoy the core gameplay loop, I think you will find that exploration does play quite a pretty neat role in it.