Hammervatnet is a lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in the municipality of Levanger

Levanger

Levanger is a town and municipality in Nord-Trøndelag county, Norway. It is part of the Innherred region. The administrative centre of the municipality is the town of Levanger...

 in Nord-Trøndelag

Nord-Trøndelag

is a county constituting the northern part of Trøndelag in Norway. As of 2010, the county had 131,555 inhabitants, making it the country's fourth-least populated county. The largest municipalities are Stjørdal, Steinkjer—the county seat, Levanger, Namsos and Verdal, all with between 21,000 and...

 county, Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. The 6.03 square kilometres (2.3 sq mi) lake lies on the north side of the village of Åsen

Åsen

Åsen is a village and former municipality in Nord-Trøndelag county, Norway. The former municipality constitutes the southern part of the present-day municipality of Levanger, bordering Stjørdal to the south....

. The European route E6

European route E6

European route E 6 is the designation for the main north-south road in Norway, and the west coast of Sweden, running from the southern tip of Sweden, at Trelleborg, into Norway and through almost all of the country north to Finnmark. The route ends close to the Norwegian border with Russia...

 highway runs along the eastern tip of the lake.

The nearby lake Hoklingen

Hoklingen

Hoklingen is a lake in the municipality of Levanger in Nord-Trøndelag county, Norway. The lake lies just to the east of the village of Åsen and about south of Skogn....

 flows into the river Fossingelva which flows into Hammervatnet. The main outlet of Hammervatnet flows into the Hoplafjorden, an arm of the Trondheimsfjord

Trondheimsfjord

The Trondheimsfjord , an inlet of the Norwegian Sea, is Norway's third longest fjord at long. It is located in the west central part of the country, and it stretches from Ørland in west to Steinkjer in north, passing the city of Trondheim on its way...

. There are two large islands in the lake Hammervatnet: Innerøya and Ytterøya. The two islands are connected by a thin, marsh

Marsh

In geography, a marsh, or morass, is a type of wetland that is subject to frequent or continuous flood. Typically the water is shallow and features grasses, rushes, reeds, typhas, sedges, other herbaceous plants, and moss....

y isthmus

Isthmus

An isthmus is a narrow strip of land connecting two larger land areas usually with waterforms on either side.Canals are often built through isthmuses where they may be particularly advantageous to create a shortcut for marine transportation...

.