French Camping

I have an electrical connection that connects to the site via the blue tube-type connector, and connect my devices to the main unit with 3 sheets. I understand I need a plug adapter European to France, but do not understand what it is: Is this something between the blue connector and supply camping, or is it something in between the main unit '3 sheets and my equipment. Would really appreciate a link to an example in Halfords etc. Thank you.

I hope you have an answer, but you realize that the US / Canadian power is totally different from European