It is surprising hat no- one has yet mentioned Pulau semakau, a island off Singapore that has the curious distiction of being the only island in the world fabricated almost entirely from rubbish....
(it is a landfill, , parts of it grassed over)
Well not entirely... it's actually two small islands reclaimed from the original residents, the last one moving out in 1991. The waste is burned prior to bringing to the site so as to eliminate much of the smell. The project is apparently going to last until 2045 but depending on how much waste can be recycled it may go longer or shorter than that.
perhaps this is a solution to rising sea levels? Countries that product enormous amounts of rubbish can turn it into ash then ship it to islands that are rising, and then perhaps they can be built up? /random musings./
QI is an island 4km southeast of Cua Lo Beach in Vietnam. It is called Song Ngu Island, but is really two connected islands. From the air it looks like a huge fish or two fish swimming on a wave.
A sunken island leading to Chinese and Russian troops in dispute.
The Soviet Union and People's Republic of China had a serious border clash 1969. in the vicinity of Zhenbao/Damanskii Island on the Ussuri River. The island under water for a large proportion of the year was claimed by both countries. The dispute resulted in troops from both sides firing shots over the border until a ceasefire prevailed.