The Iža-Leányvár Castle (Latin name Celamantia or Kelamantia) was a Roman military camp on the territory of today's Slovakia, Nitriansky District, Komarno County. It served to secure an important river crossing and bridgehead on the north bank of the Danube, the latter being directly opposite the legionary camp of Brigetio. In large sections, the river formed the border (Limes Pannonicus) of the Roman province of Pannonia Superior to the so-called Barbaricum, so that the crew of the fort also carried out security and surveillance tasks in this section.
The fort is the largest known Roman military settlement in Slovakia. Its remains, which are open to the public, are located on the eastern outskirts of the southern Slovakian village of Iža, in the immediate vicinity of the banks of the Danube. However, due to a lack of modern excavations, many structural findings that were discovered shortly after the turn of the 20th century cannot be clearly assigned to a specific time. The fort site has been part of the Danube Limes, which has been declared a UNESCO World Heritage Site (Wikipedia), since 2021.