The Birsig is a small river located in the Basel-Stadt region of Switzerland. It flows through the city of Basel and is a tributary of the Rhein River. The river is approximately 10 kilometers long and is known for its picturesque surroundings and historical significance. The Birsig has played a role in the development of the city, providing water for various uses over the centuries. Today, it is often enjoyed by locals and visitors for recreational activities such as walking and cycling along its banks, contributing to the area's natural beauty and urban charm.