The English Channel: The Channel is a narrow sea passage which separates England and France and connects the Atlantic Ocean and North Sea.
The Dee estuary:
A small sea ( in Irish Sea) where the Dee River enters.
"The Act of Union of 1801": In 1801 the English Parliament passed an act by which Scotland, Wales and the Kingdom of England were constitutionally joined as the Kingdom of Great Britain.
It is one of the Celtic Language, and is spoken in parts of the Highlands.
The "backbone of England": It refers to the Pennies, the board ridge of hills.
Lead ore: British lead ores have been worked since pre-Roman times. It contains silver.
China clay: The deposits of china clay in Cornwall are of great economic value.