Among the areas she visited included Mullivaikal, which was where civilians were believed to have been killed during the war.
Pillay also visited Jaffna town and met government officials as well as civil society members.
At least two demonstrations were held during Pillay's visit to Jaffna.
The demonstrators urged Pillay through placards and posters to look into their family members reported missing during and after the war.
Pillay, who is on a seven-day visit to Sri Lanka, said Sunday that following her visit she would be reporting on the human rights situation in Sri Lanka to the UN Human Rights Council in Geneva.
Pillay said that she is not visiting Sri Lanka to criticise the country but to look into human rights concerns.
She said that she wanted to see if the government was complying with the human rights standards set to the whole world and accepted by the Sri Lankan government.
--IANS (Posted on 28-08-2013)