Export

I am not sure if here it should be option a) or b)
what do you think?

a) 80 kms from the cities of Colonia del Sacramento and Nueva Palmira (main port where bulk is exported)

b) kms from the cities of Colonia del Sacramento and Nueva Palmira (main bulk-exportation port)

the original text:
a 80 de las ciudades de Colonia del Sacramento y Nueva Palmira (principal puerto granelero del país)

However you say it, the word "bulk" is a bit ambiguous without additional information. How about "the principal port for shipping goods in bulk, i.e. without packaging".