Bighorn is a town in Drum Island. It's located near the river the Straw Hat Pirates docked in and also neighbors Cocoa Weed. Because it's so close to the Drum Rockies, it's susceptible to avalanches.
Most of the houses in Bighorn are cylindrical and feature roofs with an unique conical shape. The buildings are distinct enough that Nefertari Vivi was able to recognize the town after getting lost in Drum with Usopp and Roronoa Zoro.
Drum Island Arc
When the Straw Hat Pirates first arrived on Drum Island, Dalton escorted them to Bighorn after understanding that they were not dangerous and required help with Nami. There, he explained to the pirates about the country's only doctor, Kureha, and how she lived at the top of the Drum Rockies, in the once abandoned Drum Castle. Not wanting to waste time with Nami's condition, Monkey D. Luffy and Sanji hurriedly set out to climb the mountain with Nami in tow as Usopp and Vivi stayed behind.
Being informed by Negikuma Maria that Kureha had descended from the mountain and was looking for patients at Cocoa Weed, Dalton, Usopp and Vivi set out to find her there. This left Bighorn defenseless against Wapol and the Bliking Pirates, who had returned to the island by then. Learning about Wapol's return at Cocoa Weed, Dalton hurried back to Bighorn through the use of his powers in order to confront his former king.
After eating some of Bighorn's buildings, Wapol was attacked by Dalton, who started fighting the invaders. Chess took advantage of Dalton's love for his people to shoot him down with arrows meant for some rebellious islanders. Before anything else could be done though, an avalanche caused by some enraged Lapahns engulfed the whole town in snow. Wapol and his officers were able to survive and escape from under the snow, setting off to confront Luffy (who Wapol blamed for the avalanche).
Meanwhile, Wapol's foot soldiers remained in Bighorn, preventing the locals from digging Dalton out. Usopp and Vivi eventually returned to Bighorn by accident, having reunited with Zoro on the way. Zoro defeated Wapol's soldiers, clearing the way for the townsfolk to finally rescue Dalton. The present Straw Hats and Dalton then headed to Gyasta in order to use Kureha's ropeway to reach Drum Castle and help Luffy against Wapol, but by the time they arrived, the battle was already over.
Sky Island Saga
Wapol's Omnivorous Hurrah
Water 7 Saga
- One Piece Manga and Anime — Vol. 15 Chapter 133 and Episode 80.
- Bighorn is hit by an avalanche.
- One Piece Manga — Vol. 16 Chapter 139 (p. 5-6).
- One Piece Manga — Vol. 26 Chapter 243, cover story: Wapol's Omnivorous Hurrah Vol. 7.
- One Piece Manga and Anime — Vol. 45 Chapter 440 and Episode 324, Dalton informs Dr. Kureha of Chopper's newly issued bounty.