The Tripiti Gorge is the second gorge west of Samaria. This gorge you can reach by first walking op towards the saddle at Gingelos. This gorge is very difficult to access and difficult to find the right way. You definitely need an experienced guide. The gorge ends at the South coast at the track Sougia-Agia Roumeli.
It is possible though to walk or take a taxi boat to the exit of the gorge and walk from there a part of into the gorge!