Lake Steinhude, German: Steinhuder Meer, German pronunciation^ⓘ,^[2] is a lake in Lower Saxony, Germany located 30 kilometres (19 mi) northwest of Hanover. Named after the nearby village of Steinhude, it has an area of about 30 square kilometres (12 sq mi), making it the largest lake of northwestern Germany. At the same time, Lake Steinhude is very shallow, with an average depth of only 1.35 metres (4.4 ft) and a maximum depth of less than 3 metres (9.8 ft). It lies within a region known as the Hanoverian Moor Geest.

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Steinhuder Meer
Wilhelmstein fortress in the lake
Steinhuder Meer
Location	30 km NW of Hanover, Lower Saxony
Coordinates	52°28′N 9°20′E
Primary inflows	groundwater, precipitation
Primary outflows	Steinhuder Meerbach (towards Weser)
Basin countries	Germany
Max. length	8 km (5.0 mi)
Max. width	4.5 km (2.8 mi)
Surface area	29.12 km2 (11.24 sq mi)
Average depth	1.35 m (4 ft 5 in)
Max. depth	3 m (9.8 ft)
Water volume	0.088 km3 (0.021 cu mi)
Surface elevation	38 m (125 ft)
Islands	2 (Wilhelmstein and Badeinsel)
Settlements	Steinhude,Hagenburg, Mardorf
Ramsar Wetland
Designated	26 February 1976
Reference no.	87[1]

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It is part of the glacial landscape formed after the recession of the glaciers of the latest Ice Age, the Weichselian glaciation. There are two theories regarding how the lake of Steinhude was formed. One of them says that glaciers gouged out the hole and meltwater filled it. The other theory states that an ice storm formed the hole and as the groundwater rose, the lake was created.^[3] In its middle there is a small artificial island carrying an 18th-century fortification, the Wilhelmstein. Today the lake is the heart of a nature reserve, the Steinhuder Meer Nature Park, and is also used as a recreational area.

The lake has two islands, both of them artificial:

• Wilhelmstein (12,500 m² or 3.1 acres) off Hagenburg was built between 1761 and 1765. It was turned into a military fortress between 1765 and 1767 by William, Count of Schaumburg-Lippe. Afterwards it briefly served as military school (one of its graduates was Gerhard von Scharnhorst who later became Chief of the Prussian General Staff). From 1777 until 1867 the island was used as state prison of the Principality of Schaumburg-Lippe.
• Badeinsel Steinhude (35,000 m² or 8.6 acres) was built in 1974-75 using sand retrieved from the lake. It has a sandy beach which is popular during summer; a service centre is available. Access to the island is via an 80-metre (260 ft) pedestrian bridge from Steinhude.

The lake is a popular destination for locals and for vacationists. Up to three ships offer cruises; they are supplemented by smaller boats running on schedule across the lake. A bike path approximately 35 kilometres (22 mi) long encircles the lake, crossing various landscapes.