Miyako Strait
The , also known as the Kerama Gap, is a waterway which lies between Miyako Island and Okinawa Island consisting of a 250km-wide passageway with international waters and airspace. It is the widest strait in the Ryukyu Islands.

Political significance
The Miyako Strait is of global geopolitical significance, as it is one of the few international waterways for China's People's Liberation Army Navy to access the Pacific Ocean from the East China Sea.  The PLA Navy used the strait on a large scale for the first time in April 2010, an act which has since become a commonplace practice for them to conduct military exercises in the Pacific.

Cultural significance
The Miyako Strait represents a cultural and linguistic split between the Southern and Northern Ryukyuan languages, with the north being more influenced by Japanese culture. The Northern Ryukyu Islands have historically been more advanced (socially, technologically, and infrastructurally) than the Southern Ryukyu Islands.

References

Ryukyu Islands
Straits of Japan
Landforms of Okinawa Prefecture