Lasagnalandia
Lasagnalandia was a peninsula once located in Garfeet Rainforest, although it broke off from the mainland in Great Sludgian-Garf Seperation in 67,689,222,001 BC after the Randilian Sludgekin warriors had physically separated the land from the Garfeet Rainforest. The land eventually collided with a land strip east of the Steam City Land Area and remained there, becoming Cold Island.
It's known that Garfs and Randillian Sludgekin had inhabited this region, there's no suggesting evidence that they actually built anything there, it's theorized that it was used more as a battle ground of sorts during multiple wars.