Ostra is a town and comune in the Marche, central Italy, near the modern Ostra Vetere, south-east of Senigallia. The modern town is founded n…Ostra is a town and comune in the Marche, central Italy, near the modern Ostra Vetere, south-east of Senigallia. The modern town is founded near the site of ancient Ostra, a Roman settlement. Its name was later changed to Montalboddo, and reverted to Ostra in 1881.