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I have an answer:

Use the afterpage package to start the landscape environment after the end of the current page.


\afterpage{
\pagestyle{empty}
\begin{landscape}
\input{./Tables/myLongTable.tex}
\end{landscape}
\pagestyle{fancy}
}


I'd like to adjust the page margins using the geometry ...

Hello

I would like a particular behaviour in my document and I can't find anything about how to achieve it.

I have a couple of longtables in my document, which are wide enough to require empty landscape pages. I put them in with the code below. I would like the pages this produces to slot nicely ...