Lillesand is bordered in the north by Birkenes municipality, to the east by Grimstad municipality and to the south by Kristiansand municipality. The lake �stre Grimevann is a large lake in the northern part of the municipality.
The Blindleia is an inland waterway that starts in Gamle Hellesund in H�v�g near Kristiansand in southern Norway, and continues past Lillesand. It is a salt water passage protected from the open sea by the offshore archipelago.
Navigation through the Blindleia passage requires attention to detail, but is not difficult as there are no tides, and very little current. The minimal tidal change in the skerries is due to its geographical location; the tidal flow that comes in from the Atlantic Ocean splits on the British Isles. One tidal stream goes through the English Channel, while the other goes around the north of the British Isles. The stream of the English Channel reaches the coast of Norway before the wave traveling around the British Islands. These two tidal "waves" are completely out of phase when they meet here, neutralizing the tidal effect
