Cashelcolaun and Regans

Grandma Regan was from Cashelcolaun. Her father was John Regan, who's father was also John. I didn't connect that of course he would be on Griffith's from 1860s (note, to find Cashelcolaun in Griffiths, need to search for it in county Mayo since this was Mayo before 1890s):

So his is plot #3b.

Unfortunately plot #3 is not broken by sub-plots, so we don't know where 3b is. But, all the houses are along the local road in the center. This is likely where Kath met Andy O'Connor and found the Regan plot?

Cashelcolaun is reachable by the N5, which cuts across the top of the townland. L1244 is the local road to the upper right.

Need to turn off the L1244 into the neighboring townland of Pollboy to reach Cashelcolaun.