Maghery (The O'Connors Stronghold
The O'Connors Stronghold can be found on the north-east end of the   Derrywarragh Island. It is a 17th century fortified house. The existing remains measure about 18 ft by 14 ft and include a standing 32 feet (9.8 m) brick chimney stack. According to Craigavon Museum Services, it was probably a &quot;watchtower to protect the mouth of the River Blackwater&quot;. Derrywarragh is linked to Maghery by land ,How can it be an Island?
In 1802 work started under the direction of Daniel Monks to excavate a short channel from the eastern bank of the Blackwater straight to the lough shore through the lower section of Derrywarragh Peninsula thus turning it into what is now Derrywarragh Island.
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