The Festungsfront Oder-Warthe-Bogen (Fortified Front Oder-Warthe-Bogen), also called the Festung im Oder-Warthe-Bogen or Ostwall (East Wall), and in Polish the Międzyrzecki Rejon Umocniony, MRU (Międzyrzecz Fortification Region), was a fortified military defence line of Nazi Germany between the Oder and Warta rivers, near Międzyrzecz. The part around Międzyrzecz (Meseritz) has been colloquially referred to as the Regenwurmlager (lit. 'Earthworm camp'). Built in 1934–44, it was the most technologically advanced fortification system of Nazi Germany, and remains one of the largest systems of this type in the world today. It consists of around 100 concrete defence structures partially interconnected by a network of tunnels. Some of the forts and tunnels are available for visiting.
The most interesting part is the central section, which begins in the south with the so-called Boryszyn Loop near the village of Boryszyn (Burschen) and extends about 12 km to the north. Another interesting part of MRU is located in Pniewo (Fischerhaus) in the Międzyrzecz District. In the central section the bunkers are interconnected with a system of tunnels, 32 kilometres (20 mi) long and up to 40 metres (130 ft) deep. In the underground system there are also railway stations, workshops, engine rooms and barracks.
It is also the largest European underground bat refuge, giving shelter to some 35,000 bats of 12 species in the wintertime.
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