There are 7 Harpoon Guns in Fisch, out of which six are obtained through exploration, while the Relic Piercer can be crafted at the Ancient Archives. Players can use the Harpoon Guns to catch the roaming fish under the water along with the Spears.
The Harpoon Gun is a vital utility item in Fisch that allows you to catch roaming fish underwater, along with the Spear. As of now, there are seven Harpoons inside Fisch, each located on a different island. So, if you are wondering where to find all of these Harpoon Guns, here is a detailed location guide with exact GPS coordinates.
Where are the seven Harpoon Guns located in Fisch?
Below, you can find all seven Harpoon Gun locations in Fisch & the fastest way to reach them inside the game.
Steady Harpoon Gun - Roslit Bay

The Steady Harpoon is the easiest to locate out of all. Hop on a boat and go straight to Roslit Bay, where you can find this one near the docks at GPS (-1479, 133, 791). This is right opposite the Roslit Blacksmith shop. Pay C$ 9000 to get your first Harpoon Gun in Fisch.
Fungal Harpoon Gun - Mushgrove Swamp

For the Fungal Harpoon Gun, you must travel to the Mushgrove Swamp. Use the marker on the screen and reach the location. Here, go towards the center of the map to find the Aligator Swamp. From that location, take a left to find the glowing Fungal Harpoon Gun next to a tree at GPS (2658, 131, -835). Pay C$155,000 to get the Gun.
Frost Biter - Boreal Pines

The Frost Biter Harpoon Gun is inside a house at Boreal Pines. Go to the Northern Expedition to reach the other side of the map. Then make your way to the Boreal Pines. Here, go towards the center of the map to find an isolated house at GPS (21463,234, 3922). Enter this house to find the Frost Biter sitting on top of a table available to buy for C$ 270,000. Remember, you can only get the Rod if you have completed 100% of the Boreal Pines Bestiary.
Great Dream Waker - Cursed Isle

The next one is available at the Cursed Isle. This island/landmark only spawns during the Foggy/Autumn/Summer nighttime. So, either use a Sundial to speed up your Celestial cycle or wait until it turns night. Then head towards the island using the marker on the screen. After reaching the place, go towards a small broken storage room at GPS (1871, 135, 1280.5) to find the Gun in a corner. Pay C$ 1,500,000 to get the item. You need to finish at least 75% of the Cursed Isle Bestiary to add it to your bag.
Crystal Crasher - Crystal Coves

The Crystal Crasher is a challenging one to obtain, as reaching Crystal Coves takes an ample amount of time. Firstly, try to find a Mysterious Whirlpool that spawns randomly around the map to take you to Vertigo. Here, make your way into the Depths and locate the Cave entrance that takes you to the Crystal Coves. Once you are inside the Crystal Coves, look towards your right side to find the Crystal Crasher Harpoon Gun at the ledge next to the large purple Crystal at GPS (1352, -612, 2400). Pay C$2,400,000 to make it yours.
Relic Piercer - Ancient Isle

The Relic Piercer is actually a craftable Harpoon Gun in Fisch. For this, you will require the following parts.
- x3 Moonstone: There is a 1.4% chance to get a Moonstone inside a Meteor at Ancient Isle.
- x2 Scrap Metal: You can catch Scrap Metal anywhere around the Ocean area using the Training Rod at any given time.
- x1 Meg's Spine: Try fishing around the Ancient Isle using the Training Round to get the Mysterious Spine or Meg Spine. You can also deploy a Crab Cage to get the mythical item.
Once you have all three materials, go to Ancient Archives and make one Relic Piercer for yourself.
Trident Striker - Atlantis

The Trident Striker is inside the Trident Vault. Firstly, travel to the Desolate Deep and Dive to reach the Trident Temple area or the ???. Then shoot the five glowing orange spots using any of your Harpoon Guns and place Relics to open the secret passageway that takes you all the way down to the Trident Temple/Vault. Here, you can purchase the Trident Striker for C$ 175,000.
For more on Fisch, check out Fisch Chapel Guide - Location, Rod Skin Quest & more or How to get the Cheeto Rod in Fisch - Roblox