RAF Castle Archdale is correct Sabre SiR.
On the east shore of Lough Erne, Northern Ireland. A famous Coastal Command RAF & RCAF Sunderland and Catalina base. Picture about 1944.
As BS observes, Killadeas is about 4 miles further south and was, I understand more of a flying boat OTU, with St Angelo airfield as the Coastal Command Instructors School a similar distance south of Killadeas. RAF Boa Island - a signals station at the top end of Lough Erne, completed the picture. LFH
Sabredog has control.