Tumulus Großmugl, Archaeological burial site in Lower Austria, Austria

The Leeberg, also called Tumulus Großmugl, is a round burial mound of loess and loess loam that rises 16 metres above the plain at 265 metres above sea level, making it one of Central Europe's largest tumuli. It was heaped up during the Hallstatt culture and has not yet been scientifically opened. A cross stands on its summit.

The Leeberg was heaped up during the Hallstatt culture, in the Early Iron Age, and has not yet been scientifically opened. It is the most conspicuous archaeological relic of the prehistoric settlements in the area around Großmugl. The mound consists of loess and loess loam, and its steep, dry slopes were never farmed.

The mound gave the market town of Großmugl its name: the oldest recorded form is Grassemugl, meaning "large Mugel", with Mugel the local word for a hill. The 16-metre rise is visible from far across the plain, so the burial mound itself became the landmark people named the settlement after.

The mound sits in open countryside and is visible from various angles but is best explored on foot. Visitors should note that on-site facilities are minimal and interpretive signage is limited.

The mound's steep, dry slopes were never farmed, so a species-rich pannonian dry grassland survived there, rated regionally important in Austria's dry-grassland catalogue. Wallis fescue and needle grass grow on the summit, couch-grass dry turf on the slopes, with Centaurea stoebe dominant in places. Fertiliser and pesticide drift from surrounding fields now threatens it.