evidence: Lake Constance (known in German as Bodensee) is a central European lake 63 km long, bordering Germany, Austria and Switzerland. The Rhine River flows into it and its two parts lie on either side of the river: the "lower lake" and the "larger lake" (upper lake). Connected by the coastline, it is a summertime location to go for sailing, windsurfing and swimming. [...] The Lake Constance EuRegio cross-national day card and the Lake Constance Experience Card, which may be used for multiple days, grant free entry to 195 excursion sites and can be used on boats, buses, cableways, and trains. Mainau Island, with its flower gardens and parks, and the Reichenau peninsula, with its UNESCO World Heritage-listed abbey, are popular cruise destinations to surrounding non-Swiss terrain. [...] The gently rolling hills around Lake Constance make for ideal hiking and biking terrain. Water sports, trails for walking and hiking, and notably pathways for cycling are only some of the recreational options available in this vacation spot. The Lake Constance Cycle Path is a long and popular route that goes all the way around the lake.