Translation of cuadragésimo

In the meantime I am listening to some Spanish CDs. They are intended for the car, but no one can tell you when to listen to it, how many times and how often. Please understand that I work a lot.
The ride took us through mountainous areas, covered with dark green forest, with so many curves that I got sick. I wanted to vomit but I held myself back, as there were so many other next to me.
The following day we took a boat trip to see the Los Glaciares National Park, where many glaciers formed hugh lakes. Many ice bergs were floating in these lakes and some of them had bizarre light blue colors.