Just got these records & need help: Owen Hegarty m. Catherine O'Neil Feb 1850 in Ballinascreen, Co. Derry. Where or what is Ballinascreen? and where would I find the Roman Catholic church they were married in?

Their childrens records read: Francis b.Apr 15, 1852; Address: Cavanrea(where is that at?)Ballinascreen; RC church

Twins Patrick & James b.Mar 1854 Address:Glengavna(again??)Ballinascreen; RC church

Mary b.Mar 1857 Address:Glengavna?? Ballinascreen.

Just really confused! Is it possible that Glengavna and Cavanrea are street names or could they be abbreviated for something? Am having a hard time finding these places. I also get confused on the Irish way of naming things, here in the states we are town or city name, county and state, but in Ireland you have a few extra meanings, like town or townland, civil and parish names.

Any Hegarty's out there who are related???
Can anyone decipher these records for me please! I really can't afford to PULL anymore hair out, it's getting pretty thin as it is!!! LOLOL Thanks, Jeanne