The woman is short, has her hair in a long braid and was wearing a black or blue jacket and jeans when she was last seen.
She probably has a dog with her. According to the police, the woman has an illness that can cause her to be confused and have difficulty locating herself.
During Saturday evening, a large search operation is underway with several police patrols, dog patrols, a police helicopter and civilian resources.
The police urge people who saw the woman to contact 114 14, or 112 if the situation is urgent.