It is the northern section of the Gulf of Riga, extending north to the eastern Baltic Sea.
The area of the Väinameri Sea is about 2,200 square kilometres (850 sq mi).
The Kumari Channel is a shipping lane running north–south in the Väinameri.
The Rukki Channel runs east–west between Hiiumaa and the port of Rohuküla on the mainland.
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