Brenner Moor, Nature reserve in Bad Oldesloe, Germany.

Brenner Moor is the largest inland salt marsh in Schleswig-Holstein, lying in the Trave lowlands almost entirely within Bad Oldesloe. The Trave borders it to the north and east, a drainage ditch to the west. Salt springs bring brine with 15 g/l salt from about 500 metres deep, feeding plants otherwise found only near the coast.

The area was placed under protection in 1978, marking a shift in how the region approached conservation. This protection status helped keep the moorland from being converted or built upon.

Visitors come here to observe wetland life and understand how these ecosystems shape the local environment. The trails and information signs help people connect directly with the natural world around them.

The reserve is easy to access with several marked trails of different lengths to suit various fitness levels. It is best to wear sturdy footwear and stay on the paths, especially during wetter months.

The salt springs here rise from about 500 metres underground with a salt content of 15 g/l, and in places the water matches North Sea salinity. This lets coastal plants such as Juncus gerardii, Triglochin maritima and Puccinellia distans grow far inland, with Vaucheria algae forming mats around the springs.