Untersee / Sandseele (Reichenau Area)

Untersee / Sandseele on Reichenau is a small, shallow Lake Constance riding area with sand bottom and a very shallow sloping entry. A key feature is the extensive standing zone near the shore, which makes the water feel manageable for beginners on windsurfing days. The shore break is reported as none, and conditions are typically described as shallow flat-to-choppy water rather than surf-like waves. Wind is mainly associated with frontal systems, with the most useful wind directions broadly in the South through West/Northwest range (S, SSW, SW, WSW, W, WNW, NW). The best months for rideable conditions are March, April, September, October, and November. A thermal pattern is not described as reliable here; instead, rideability depends on getting the right weather fronts. Reported winds are often in the range of roughly 12–25 knots, with moderate gustiness when conditions are right. Kitesurfing is possible but is tightly regulated: a special Lake Constance permit is required and riding is limited to designated zones/corridors. Additional restrictions are reported for kitesurfing, including a maximum line length (25 m) and an emphasis on experienced riders. Hazards at the spot include swimmers, ships/boating traffic, and stakes marking shallow areas or zones, and riders are advised to stay within the shore area and closely watch boat traffic and designated ferry/route paths. For windsports, the launch is accessed via the campground area at the western tip of Reichenau. Practical downsides include limited launch space and, during summer, a high mix of swimmers and campers that can make safe setup and navigation more demanding. On the water, water temperatures run cold in winter (around 4–6°C) and warm to roughly 20–24°C in summer, so wetsuit choice is a major part of staying comfortable across the season.