A 10 minute walk over the fields to the north east from Geoghegan's Bluff will bring you to Y Ravine and Gurkha Bluff, above Y Beach.
Y ravine itself is densely overgrown and it is virtually impossible to find a way down to the beach. However, there is a navigable path running down the north shoulder of Bruce's Ravine, north of Gurkha Bluff. It is steep and overgrown and it would not be sensible to attempt this on one's own or in anything but dry weather. Good boots and a stick are highly recommended. I have made this descent on two occasions, both in the company of another walker. A reasonable level of fitness and mobility is needed.
Y Beach was the scene of landings by the 1st KOSB, SWB, Plymouth Battalion and Royal Marines on 25th April 1915. The beach is hardly more than a rocky foreshore, but opposition was minimal and by mid-morning troops could be seen on the cliffs above. Scouting parties crossed Gully Ravine and came within view of the village of Krithia. The critically important move was to push quickly inland and southwards to link-up with the landing troops at X beach, but it was not made, and lack of artillery support and rapidly increasing Turkish opposition led to an almost spontaneous evacuation on 26th April, spurred on by confused orders and lack of communication. It would take several months and hundreds of lives to retake this position. This was notably achieved by the 1/6 Gurkha rifles over 10/11th May 1915. It was this feat of arms which led Sir Ian Hamilton to order that the former Turkish strong point should be known thereafter as Gurkha Bluff.
Back on Gurkha Bluff, Just north of Y Ravine, you will see a line of trees and scrub running from the western seaward cliff above Bruce's Ravine. A closer inspection will reveal the remains of a deep trench, photo above, (yes, that's me!) within the trees. This is what remains of Gurkha Mule Trench, which ran up from Gully Ravine to Gurkha Bluff and the 'J' trench systems on this part of Gully Spur.
Following below are additions from my September 2015 visit are short HQ videos of a walk through a section of Gurkha MuleTrench in the trees above Y Ravine and a visit to Y Beach itself.
Gurkha Mule trench, September 2013
This view looks northward westward towards Gurkha Bluff. The trench is very well preserved in the trees beyond, (see above photo and video above) but out on the fields 100 years of ploughing and weathering has slowly filled it in. A few metres behind the position where this photo was taken all evidence of the trench disappears, until its entrance into Gully Ravine can be discovered a few hundred metres to the SW.