Since 180 degrees longitude marks the International Date Line, this location is on the boundary between the Eastern and Western Hemispheres. It's important to note that this is a theoretical line that runs through the ocean.
There are no islands or landmasses at this exact point, but the nearest landmasses are:
* To the north: The island of Kikai in the Ryukyu Islands of Japan.
* To the south: The island of Tahiti in French Polynesia.
It's also worth noting that the International Date Line does not perfectly follow the 180 degree meridian. It deviates in some places to avoid cutting through land masses.