A large lake bordered by Germany, Austria, and Switzerland, known for its recreational activities like sailing, swimming, and cycling along the scenic shores. It's a key attraction for both locals and tourists.A large lake bordered by Germany, Austria, and Switzerland, known for its recreational activities like sailing, swimming, and cycling along the scenic shores. It's a key attraction for both locals and tourists.A large lake bordered by Germany, Austria, and Switzerland, known for its recreational activities like sailing, swimming, and cycling along the scenic shores.