Police are increasingly concerned for the welfare of missing 42-year-old Helena McElhennon.
A post on PSNI Facebook describes Helena as 5ft 4ins tall, of a medium build, with short hair.
They add that she is possibly wearing a maroon coloured cardigan or a long brown dress.
Helena was last seen in the Draperstown area around 9.30am yesterday - "and was heading towards Derry/Londonderry".
The post adds: "She may be in the Derry/Londonderry, Limavady or Magherafelt area.
"Police are asking anyone with information regarding the whereabouts of Helena to contact us immediately on 101 quoting serial 771 of today’s date."