Blindleia is an 20-kilometre (12 mi) long inland waterway in the municipality of Lillesand in Aust-Agder county, Norway. It starts in the Gamle Hellesund or Ulvøysund areas in southern Høvåg in the southwest (near Kristiansand) and it continues northeast past the city of Lillesand. It is a salt water fjord passage that is protected from the open sea by an elongated archipelago of skerries. There are several narrow gaps as part of the waterway, some of them only 10 metres (33 ft) wide.