This bay is actually a large lagoon, connected with another, The Hamar Bay, and both separated from the sea by relatively wide isthmus.  Both continuously grow shallower because of the silt deposits of the rivers spilling into them.  Large areas dry up during low tides and it few islands grow in size.  Inland from the bay is a county by the same name.
It is renowned for its natural beauty and possibilities for outdoor activities.  In its mountainous region are quite a few spots with thick layers of ignimbrite.