Lake Sempach

Sempachersee is a lake in the canton of Lucerne, central Switzerland, and the municipality of Eich sits on its shore. The water covers roughly 14.5 km2, reaches 87 m at its deepest point and averages about 44 m. It is one of the larger lakes on the Swiss Plateau, and it feels quieter than the busy shores of Lake Lucerne.

Where is Lake Sempach and which towns surround it?

The lake takes its name from the small town of Sempach on the eastern shore. To the north, close to the outflow of the river Suhre, lies Sursee with its well-preserved old town. Nottwil and Eich complete the ring of villages, which makes the area an easy day trip from the city of Lucerne. Historical records mention Eich as early as the 12th century, in connection with fishing rights on the lake.

What is there to see?

Sempach is the main stop. Its medieval layout is easy to explore on foot, and the surrounding fields were the setting for the Battle of Sempach on 9 July 1386. The Swiss Confederates defeated a Habsburg army, and Duke Leopold III died in the fighting. The result weakened Habsburg power south of the Rhine and still shapes Swiss commemorative culture. St. James's battle chapel was consecrated in 1387, and an annual memorial event takes place near the anniversary. Sempach is also home to the Swiss Ornithological Institute, which marked its 100th anniversary in 2024.

How can you spend active time here?

Lucerne Tourism describes marked routes around the lake:

• a walking path around the shore of about 19.5 km, taking close to 4 hours 50 minutes,
• a cycling loop of roughly 32.7 km,
• a longer hiking route of about 39 km through the surroundings.

The terrain is gentle, so the loop suits families and casual riders. In summer people swim and sail on the lake, and anglers fish its waters.

When should you visit?

Late spring to early autumn gives the warmest water and the driest paths. Around 9 July or in late summer you can catch the battle commemorations in Sempach. Out of season the lake is calm and suits a quiet walk.

How do you get there?

Trains from Lucerne reach Sempach and Sursee in under half an hour, and regional buses link the shore villages. Driving takes a similar time. Cyclists can join the loop in any lakeside village.

Frequently asked questions

How big is Lake Sempach?

About 14.5 km2 in area and 87 m at its maximum depth.

Can you walk around the whole lake?

Yes. The walking loop is about 19.5 km and takes nearly five hours, while the cycling route is about 32.7 km.

What is Sempach known for?

The 9 July 1386 battle in which the Swiss defeated the Habsburgs, and the Swiss Ornithological Institute.

Which canton is the lake in?

Lucerne, in the upper part of the Suhre valley.