The Grand Canal curves in a great “S” through the heart of the red tile roofs of Venice, Italy, in this Ikonos image, acquired on April 2, 2001. The Canal is the main thorough-fare through the city, which is built on 118 tiny islands linked by canals and bridges. The city sits in the center of the Laguna Venetta, three kilometers from the Italian mainland and three kilometers from the Adriatic Sea. Boats, the primary form of transportation, can be seen as small white strips in the Grand Canal and the water around the island. In the large image, the causeway leading to the mainland stretches northwest from the island. The narrow length of land east of Venice, which is covered by the city of Lido, separates the Laguna from the Adriatic.
Founded in the fifth century, Venice is a UNESCO World Heritage site because of its architecture and art. Some of the city’s most famous sites are visible in this image. The large square on the right edge of the image where the Canal widens into the Laguna is St. Mark’s Square (Piazza San Marco). St. Mark’s Basilica sits on the far right side of the square. South of the Basilica, the Palazzo Ducale forms a stark, white “U.”
This image also emphasizes Venice’s fragility. Like the fabled city of Atlantis, the city is at risk of being submerged. Autumn and winter high tides flood city streets and raise water levels on the canals, making it difficult or impossible for boats to squeeze under the bridges. The high tides, called aqua alta, are also eroding the foundations of buildings, which are tightly packed along the edge of the canals and the city’s outer shores.
Image by Robert Simmon, NASA’s Earth Observatory, based on data copyright DigitalGlobe
The compact Italian city of Venice with its renowned canals is situated on a small, fish-shaped island in the Laguna Veneta at the northwest corner of the Adriatic Sea. In this photo taken from the International Space Station by the Expedition 1 Crew on February 21, 2001, one can see part of the causeway connecting the city to the mainland. The sinuous Canal Grande bisecting the city is easily visible in this scene as is the larger Canal Giudecca to the west, which leads to the port facilities on the northwestern end of the island. For centuries, the low-lying city has successfully coped with the three-foot tidal range experienced at this end of the Adriatic Sea, and the series of barrier islands has offered some protection from storm waves. However, a combination of both regional land subsidence and recent slight rises in sea level pose a significant threat this historic city and its priceless art treasures.