 The official name is the Swiss-German language term "Buechberg" (not written with "ü"), although "Buchberg" is often used.Among the area around the Holzbrücke Rapperswil-Hurden lake crossing and between Rapperswil and Busskirch around Obersee, "Güntliweid" up to "Bätzimatt" at Buechberg are listed ast bird reserves of national importance.The reserve is located on the south shore, at the foothills of Buechberg and extends from the south of "Bätzimatt" at Schmerikon to "Güntliweid" east of "Lachen".