I'm playing the English with the XL mod. I just started this and I was wondering sense I am concentrating on trade for a good economy. This is the situation.

Provence B is a very good trade provence, it has 2 goods that can be traded, but it does not touch the sea. But Provence A is between B and the sea so if I built up provence A to trade would the trade goods that would be traded be from the A procvence or from both A and B? I hope this doens't confuse anyone. Thank you.