Translation of blackness in German

I am Spanish Teacher. I graduated last year, in August. I studied mostly in Germany. I have been working for nine months as a teacher in many language schools but soon I will be a student again.
Our fisherman stopped the boat and his nine year old girl opened a box with souvenirs, clothes and hats. We were in the middle of a river not going anywhere and had to start buying things.
The American girls came with T-shirt and sandals, not exactly the right equipment for a trip 5000 meter over sea level and minus 10 degrees outside temperature during the day. Anyway, the landscape was fantastic.