Miklavatn is a lake in Fljót in Skagafjörður, Iceland. It is the second biggest lake in the region at 7.4 square kilometers. The isthmus separates it from the sea, but the runoff from the lake flows through the estuary. The lake was originally a fjord but as the isthmus formed, it closed the fjord off, turning it into a lake.
The lake offers a lot of trout fishing. Because water from the ocean often flows into the lake, it is saltier at the bottom, so various salt-water fish are also caught there. The river flows into Miklavatn from lake, and some smaller rivers flow into the lake as well.
In the early 20th century, there was some discussion around building a navigable canal through and establishing an ocean liner harbor in Miklavatn, but these plans fell through. In the 1940s, sea planes that went searching for herring had a summer base in Miklavatn.
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