Leyhörn, Nature reserve in Krummhörn, Germany

Leyhörn is a nature reserve in the municipality of Krummhörn on the Lower Saxon coast, covering approximately 650 hectares. The landscape consists of water surfaces, salt marshes, reed beds, and grasslands arranged in a mosaic pattern that supports various wildlife habitats.

From the mid-1960s, storm surges in the Netherlands and Hamburg prompted plans to dike the entire Ley Bay and shorten the coastline. The Leyhörn peninsula was built by diking from the mid-1980s until 1991. The 646-hectare area was placed under protection on 3 December 1994 as NSG WE 220.

The name Leyhörn comes from the Leybucht bay it borders. Since 2000, the remote Leysiel area has been used by the Weser-Ems beekeepers' association and the Bavarian Buckfast beekeepers' association for controlled mating of queen bees. Visitors can join guided tours into the reserve, which is otherwise closed to entry, starting from the NABU information wagon at its edge.

A wheelchair-accessible observation hut allows visitors to watch birds without needing to walk long distances through the reserve. Local naturalists regularly offer guided walks and provide information to help visitors understand what they are seeing.

Since 2000, the remote Leysiel has been used by the Weser-Ems and Bavarian Buckfast beekeepers' associations for controlled mating of queen bees. The site's isolation keeps the queens from mixing with other bee populations.