Khanty Ocean or Khanty-Mansi Ocean was a small ocean located between Baltica and an island arc (the Kipchak Arc) near Siberia, from near the end of the Precambrian time to the Silurian.
[1] The ocean is named after two indigenous peoples in Siberia (Khanty and Mansi).
[1] The Khanty Ocean was bordered by a series of oceans: Panthalassa to the north, Proto-Tethys to the northeast, and Paleo-Tethys to the south and east.
The ocean formed when the landmass of Proto-Laurasia (shortly after the break-up of Pannotia, about 600 mya) rifted and created three separated continents – Laurentia, Baltica, and Siberia.
The Khanty Ocean closed when an island arc called the Sakmarian Arc collided with Baltica.