The phrase "small island" refers to a landmass that is very small in size and is surrounded by water. It usually has limited space for people and resources. Full definition
Cats usually have small islands of thyroid tissue scattered in other locations in their bodies. (2ndchance.info)
The view from the room and balcony was amazing — all different shades of blue water with small islands in the distance. (travelcodex.com)
We held our ground and negotiated fiercely not only for the survival of the people living on small island states, but everyone on planet Earth. (goldmanprize.org)