Teen touching women at Adelaide lake

A teenager has been indecently assaulting women as they walk around an Adelaide lake, police say.

The most recent incident happened on Tuesday afternoon.

A woman was walking around the lake at Mawson Lakes about 5.20pm when a man on a bike came up from behind and touched her inappropriately as he cycled past.

The victim was not physically injured.

Police believe the man, likely aged 16 to 18, is responsible for a string of similar incidents in the area.

He is described as Caucasian in appearance, with a thin build and long shoulder-length blond hair.