The 2020 event was postponed to an as yet unknown date due to the Covid-19 pandemic.
The Mersin marathon is a relatively new (the inaugural event was in 2015) marathon which takes place in Mersin, Turkey.
Mersin is a relatively small city (~1,000,000 residents) on the Southern coast of Turkey. Its port is the largest in the Middle East, and Mersin is sunny for the majority of the year.
It is an incredibly culturally and historical rich city with numerous interesting sights to visit. If you prefer however you can relax post race on one of its many beautiful beaches.