Platosi (commonly referred to simply as Chasia) is one of the several crags located in west Parnitha and perhaps the most easily accessible, as it is located just over the road heading to Fyli / Chasia village. The characteristic cave, which is its predominant feature, invited climbers to establish some beautiful and hard routes. Platosi is a great choice for sport climbing in the range of 6b to 8a.
The north orientation of the crag makes it a good choice for climbing during the warmer months of the year. Climbing is also possible on mild winter days but during the winter many of the routes tend to dribble water after rainy days. The height of the routes varies from 15 – 30m therefore a 60m rope is enough to climb all lines. The rock is limestone of excellent quality. The bolting is good in general, especially after the recent maintenance (Spring 2012), during which old non-certified and rusty bolts were replaced by new ones.