Dąb Mazowiecki Bartek, Monumental pedunculate oak in Emów, Poland

Dąb Mazowiecki Bartek is a pedunculate oak in Emów with a trunk circumference of 587 cm and a height of 25 m (2011). Its short, massive trunk is twisted around its own axis and covered with mosses and lichens. The crown measures 26.5 by 20 m, and a chimney-like hollow and a broad wound, possibly from lightning, are visible.

The oak's age is estimated at around 300 years, which places its germination in the early 18th century. Its name was given in reference to the famous Bartek oak in Zagnańsk, although its circumference is almost 4 metres smaller. The sources do not record a date of formal protection.

The tree carries a name that references another notable oak in the Zagnańsk region, connecting it to local traditions of naming significant trees. This naming practice shows how such natural monuments become anchored in community identity and serve as points of reference for the people living nearby.

The tree stands within the Swider Nature Reserve and can be reached by following a path alongside the Mienia River. Visit during dry weather when the trail is most accessible and easy to walk.

The trunk bears a large scar likely caused by a lightning strike, giving the tree a distinctly marked appearance. Despite this wound, the tree maintains good health, which puzzles scientists who suspect the interior may be largely hollow.