Eureka! I reach the top. There are actually two peaks connected by a narrow 50 metre path. I reach the 2nd peak and balance myself for a few seconds on it's highest stone. I am the tallest person in Donegal. On a clear day they say you can see Scotland from here. But not today. It's 19.30pm, time to go back down. I don't want to be on Errigal when darkness falls.