Kerguelen Plateau in the Antarctic
Much like Mauritia, the Kerguelen Plateau used to be a tiny continent, before turning into one of the greatest volcanic plateaus on the planet. Being located beneath the Polar Front, it surfaced approximately three times in 80 million years. It was on the surface for about 40 million years, only to sink again 20 million years ago. It was discovered in 1772 by Kerguelen-Trémarec, an explorer from France, who was on an expedition to find the mysterious Terra Australis continent.
Lost Villages in Canada
During the 1950s, nine communities in Ontario were sunk on purpose during the construction of the revolutionary Saint Lawrence Seaway. Around 6,500 people lost their homes and received new houses from the government. The authorities also relocated the highways and railway tracks, however, many cemeteries were not moved except for Maple Grove since it prevented the construction from progressing.
Sundaland in Southeast Asia
Sundaland used to be yet another microcontinent before it was submerged 19,000 years ago. What caused it to sink was a rise of sea level that followed the Ice Age. Before it sank, Sundaland was twice as big as India. It is presumed that Sundaland could have been what Plato referred to as Atlantis, though some assume it could also be Lemuria, another mythical continent.
Atlantis in the East
Shicheng, also known as Lion City, was a real and beautiful city in China which had existed for 1,300 years before being intentionally submerged. The construction of a new hydropower station in 1959 caused the relocation of more than 300,000 residents. Archaeologists and other experts refer to this city as a time vault due to numerous structures and carvings that remained underwater, exquisitely preserved.