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Four jangerberries, used to make zamorak brews, can be found on an ogre-infested island north of Gu'Tanoth. The berries respawn about as fast as you can collect them, and since they are currently worth 775 coins, collecting them can be fairly profitable.
Starting at the Castle Wars lobby with only a rope in your inventory and a ring of duelling equipped, run straight east to the island. Use Surge to either cross the bridge or after the point where the character last turns before the lake to speed up the trip. Then, use the rope on the tree branch, jumping over to the island (this will use up the rope).
The ogres on the island are not aggressive. Run in a circle, continually collecting the berries. When your inventory is full, teleport back to the lobby with your duelling ring, bank, and repeat. A bank preset can be used to speed banking up.