To learn about the foods and the importance of papyrus I’m not sure about the third but maybe the clothes and it is not marriage customs I can say 100% and as well I don’t see a river so I don’t think it’s that either
Answer:
Princely states of Pakistan in order of accession
Amarkot.
Bahawalpur.
Khairpur.
Chitral.
Swat.
Hunza.
Nagar.
Amb.