Each Island Board is divided into eight numbered lands, with exactly two of each terrain (Jungle, Mountain, Sands, and Wetland).
Most pieces only affect other pieces in the same land, unless explicitly specified.
Two lands are “adjacent” when they touch, even if they’re not on the same Island Board or meet only at a corner.
Each board also shows a swath of Ocean, to indicate which lands are readily accessible by sea.
Lands adjacent to the Ocean are Coastal.
Lands not adjacent to the Ocean are Inland. (The other Island borders are rocky cliffs and do not count as Coastal.)
The Ocean itself is not a land, and is not in play.