"If it's not already raining here, it's about to! The overflowing streams and dripping vines make finding a dry spot easier said than done. If traveling by foot, make sure to bring an extra pair of wool socks! "
―Dragons: Rise of Berk
This island is dominated by tall forests with hanging vine trees and is susceptible to rainy weather. There are numerous streams there that are prone to overflowing when it rains.