This is the 9676th most frequent German word.
nachbarinsel
Neighboring island.
Here, 'Nachbarinsel' is used as a singular noun to describe a geographically adjacent or nearby island.
Die Nachbarinsel ist nur eine kurze Bootsfahrt entfernt.
The neighboring island is just a short boat ride away.
In this case, 'Nachbarinseln' is used in plural form to refer to multiple adjacent islands.
Die friesischen Nachbarinseln sind alle wunderschön und reich an Natur.
The Frisian neighboring islands are all beautiful and rich in nature.
This sentence uses 'Nachbarinsel' again as a singular noun, emphasizing a travel destination directly related to the speaker's current location.