Balla : Round Tower

CountyMayo
Grid RefM 255 845
GPSM 25488 84537 (7m)
Longitude9° 7' 52.06" W
Latitude53° 48' 18.01" N
ITM east480366
ITM north584435
Nearest TownBalla (0 Km)
OS Sheet31
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 14th January 2007

I'm not sure why I omitted to visit this round tower when I was last in the area. The tower and the graveyard that surrounds it are all that's left of an early monastic site. The tower is around 15m tall and has two doors. The one at ground level is presumably a later addition. The original door has a simple lintel and is 5m or so off the ground.

In the layer of stones immediately above the foundations there are two depressions on opposite sides of the tower. These look as if the may be reused bullaun stones to me.

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About Coordinates Displayed

This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.

Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.

Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.

The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.

UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.

ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.

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