A number of homes were evacuated in Pantteg because of the problem.
People living in Ystalyfera have the chance to learn more about which areas are most at risk from landslip.
Neath Port Talbot Council is holding a public meeting tonight at Ysgol Gyfun Ystalyfera School (doors open 6pm, meeting starts 7pm)
Last year, a number of people in Pantteg were evacuated from their homes because of landslips.
More information will be made available to locals including a 3D fly-through model showing the landslip area.
An updated hazard/risk map of the area will also be on show.
You an also view it here.
Council officials and Members will also be available to answer residents' questions.
The leader of Neath Port Talbot Council, Councillor Rob Jones said: "Earth Science Partnership is now providing residents in the Pantteg area with the most detailed information they possibly can about the risks posed by landslides which have plagued this area going back at least to the 1890s.
"We are making the information available on our website so people can digest the information ready for the public meeting in Ystalyfera on Monday evening when senior council officers and Members will be on hand to answer questions and inevitable concerns.
"We have used huge resources and a large amount of public money and have engaged trusted geological experts - whose detailed work will be peer reviewed - to give residents in the Pantteg area a greater understanding of the land that surrounds them and which they live on."