Tuonetar is a figure from Finnish mythology, known as the goddess of the underworld. She is often depicted as a dark and mysterious figure, ruling over the realm of the dead, which is called Tuonela. In mythology, Tuonetar is associated with the afterlife and is believed to guide souls to their final resting place. She is sometimes portrayed as a nurturing figure, providing comfort to the deceased, and is an important part of the rich tapestry of Finnish folklore.