Two land Bridges
Ireland and Britain had two land bridges;
These two land bridges created an inland freshwater lake. As the ice retreated sea levels rose connecting the lake to the surrounding sea becoming brackish and then saline. This water is now known as the Irish Sea removing the two land bridges between Britain and Ireland. An island nation was created. The distance today between Britain and Ireland is at their widest approximately 125miles and at its narrowest approximately 13 miles. As people still do today, they travel between the islands by boat.
The Isles of Pretani (British Isles) now had three channels known today as: