The civil parish for your Edward Donnnellan is Dunmore, there are a number of townlands in Co. Galway named Carrowreagh.
The maps shown initially on the AskAboutIreland website are from later, so dont always match the plot numbers shown on the printer valuation. These are in colour so easier to follow compared to the older map images which are in black and white, with various handwritten notations. For most areas on AskAboutIreland you can select a number of different maps using the 'Map Verson' dropdown to the top right of the map view. For Carrowreagh, Dunmore map version 4 seems to show the plot numbers with letters based around the village, but not very clear, so impossible to be certain where 1f is located. The Valuation Office in Dublin might have a clearer version.