such as state highway 75, are also present, especially on the western side of the lake. The Autostrada A1 passes five kilometers () to the west of the Lake. Navigation Strict regulations apply for the navigation on the Lake. A protected strip is established for the entire perimeter of Lake Trasimeno for a distance of 150 meters from the shore of the lake and the shore of the islands. In the protected strip navigation is only permitted for craft having a maximum length of 9 meters at the waterline, propelled by oars or by sail, at a maximum speed of two knots. Exceptions apply to authorised boats propelled by motor only in the water in front of port areas or authorized landing places. There are ferryboats, 3 small, 2 medium, and two big (two decks) called Perusia and Agilla II, based in Passignano Port, also two dredges. There are ports in Castiglione del Lago (recently totally rebuilt), S. Arcangelo, S. Feliciano, Tuoro, and several minor anchorages. Islands There are three islands in the lake. The largest of these islands is Isola Polvese, almost 1 km2. The second largest, Isola Maggiore, is the only inhabited one. The small fishing village, which reached its height in the 14th century, today has only around thirty residents. Most of the buildings, including the ruins of a Franciscan monastery, date from the 14th century. Maggiore is a 'hill', whereas Polvese is a more complex structure with plains and hills, and Minore resembles a sloped table. Minore is now uninhabited, but in the past had a village with over 500 residents. Many centuries ago, a castle with a pentagonal structure stood near the shore, near an Olivetan monastery. The castle still remains, and the ruins of the church and the monastery are almost totally preserved, despite the abandonment in the 17th century due to malaria. The malaria was eradicated only in the 1950s. There were other problems, since Trasimeno was fought over by Chiusi, Panicale, Perugia, and Florence. Florentine troops demolished Polvese in the 17th century, beginning its decline, until by the 19th century there was only a caretaker. Of the many houses, nothing remains. Minore Isle, near Maggiore, is now uninhabited, totally covered by local vegetation except for a small anchorage. In ancient times, there was a separation between the two communities, because Polvese was far away from Maggiore-Minore. According to local stories, the two