I made this Stonehide Leather farming guide to help out players who want to farm the leathers instead of buying them from the Auction House. I decided to search for places with high density of mobs which I can kill and drop [Stonehide Leather]. I traveled around Broken Isles, and after a while I made a list of places.
Stonehide Leather
Keep in mind! In Legion, several people can tag the same mob and still get loot. So, if someone tagged your mob but he didn't loot the corpse, you can't skin the mob.
If you are honored with the Highmountain Tribe, you should get the [Boon of the Butcher] enchant from Ransa Greyfeather at Thunder Totem. It allows you to sometimes loot [Butchered Meat] which can contain extra Leathers and Meats.
Don't forget to enchant your gloves with 
[Enchant Gloves - Legion Skinning]! This enchant brings skinning time down from 1.5 seconds to 0.5 seconds.
Azsuna
These are level 45 mobs, so lower levels can't farm here.
Young Bloodgazers and Bloodgazer Nest-Keepers have really fast respawn rate, and the Young Bloodgazers have really low HP, so this is one of the best stone hide leather farming place.
There are a couple of elite mobs patrolling around this area, you should avoid them, I think it's not worth to kill them.
Highmountain
These are level 45 mobs, so lower levels can't farm here.
This place is similar to the previous one, but the mobs are a bit more spread apart. You will find Young Snowfeathers and Snowfeather Nest-Keepers here. Really fast respawn rate, and the mobs have low HP. Try to avoid the elite mobs.
Suramar
These are level 45 mobs, so lower levels can't farm here.
The respawn rate of Suramar Snarlers is really fast. You will never run out of them. The best way to farm here is to pull 6-7 together with your mount, then AoE them down. (2-4 if you have bad gear) You should also pull the deers with the snarlers because they also drop Stonehide Leather.
You can get two really good buff in Suramar which speeds up your farming:
[Warpwalking] - Kills increase movement speed by 50% for 15 sec - You can get from Chief Telemancer Oculeth at Shal'Aran.
[Ley Infusion] - Infused with ley energy, causing your attacks to have a chance to inflict an additional 115625 to 134375 Arcane damage. - You can get this buff in caves around Suramar from small pillars called Ley Ward. The closest one to Shal'aran is here. (coordinates: /way Suramar 41.53, 38.96) It costs 25 Ancient mana. This buff has 50% proc chance, so for lower geared characters this is a must-have buff for farming. If someone used one pillar they will disappear, but the respawn rate is only around 2-3 minutes, so you should wait until one respawns. There is 4-5 spawn location in the cave, so just run around until you find one.
You will probably cap on Ancient Mana, so you will have to go to Suramar City and spend your mana on something. You will find vendors all around the city, but you can't speak to them until you progress a bit in the storyline and get your disguise.
Stormheim
You can find a lot of Saberfang Worg at the marked area.
Azsuna
The Llothien Prowlers are a bit spread apart at this place, so the best way to farm here is to pull 3-4 together with your mount.
