Freienbach–Hurden Rosshorn, Freienbach–Hurden Seefeld, Seegubel and Rapperswil-Jona–Technikum. Because the lake has grown in size over time, the original piles are now around to under the water level of . As well as being part of the 56 Swiss sites of the UNESCO World Heritage Site Prehistoric pile dwellings around the Alps, the settlements are also listed in the Swiss inventory of cultural property of national and regional significance as a Class object. There are further sites that are listed as in the Swiss inventory of cultural property of national and regional significance as Class A object: The chapel of St. Dionys, Schloss Rapperswil with the Polish Museum and its archive and the Rathaus (Town Council house) of Rapperswil are the more recent structures. The Roman Vicus Centum Prata at Kempraten and the Seedamm region and historical bridge (which had existed in some form since the prehistoric era through the Middle Ages with the most recent bridge in 2001 and Heilig Hüsli) round out the five. Geography Rapperswil-Jona has an area, , of . Of this area, 37.4% is used for agricultural purposes, while 30.6% is forested. Of the rest of the land, 28.6% is settled (buildings or roads) and the remainder (3.4%) is non-productive (rivers or lakes). Rapperswil-Jona is situated across the Seedamm, an ice age moraine built by the Linth Glacier, which separates Lake Zurich into an upper and lower part. The Linth Glacier, named after the River Linth, also formed Lake Zurich itself (glacial lake) and shaped the surrounding land. It was connected to the Rhine Glacier. The River Jona, which originates near Gibswil in the canton of Zürich, runs through Rapperswil-Jona and flows into Obersee. Demographics Most of the population () speaks German (86.9%), with Italian being second most common ( 3.1%) and Serbo-Croatian being third (2.1%). In the 2007 federal election the most popular party was the SVP which received 30.3% of the vote. The next three most popular parties were the CVP (19.3%), the SP (17%) and the FDP (13.1%). In Rapperswil-Jona about 74.6% of the population (between age 25-64) have completed either non-mandatory upper secondary education or additional higher education (either university or a Fachhochschule). Economy , Rapperswil-Jona had an unemployment rate of 1.84%. , there were 183 people employed in the primary economic sector and about 56 businesses involved in this sector. 3,898 people are employed in the secondary sector and there are