All longitudes converge at the north and south poles. To look at it another way,the north pole is located at 90 degrees north latitude and every longitude.
All latitudes are between 90 degrees south and 90 degrees north. No latitude is greater than 90 degrees in either direction.
40 degrees North, 88 degrees West
The Equator is termed 0 degrees. 90 degrees south is the South Pole, 90 degrees north is the North Pole.
There is no answer if you are looking for a location because there are two latitude measurements and no longitude measurements.
Sardegna.
The latitude of Bainbridge Island is 47.6553 degrees north. The longitude is 122.535 degrees west. Bainbridge Island is located in Kitsap County, Washington.
Iceland.
The island of Hawaii.
Bornholm, a Danish island.
The Bahamas.
Gotland, the largest island in the Baltic Sea.
San Nicolas Island is located at 33.2500 degrees north and 119.5000 degrees west.
Ellesmere Island and Greenland.
If you meant 18 degrees north latitude and 77 degrees west longitude, then the island is Jamaica. And, Nairobi is the capital of Kenya, and Kenya is not an island. Kenya is located in Africa.
ICELAND
There is no island located at these coordinates. The Free and Sovereign State of Sonora in Mexico is found here.