I think I know the difference between allí and allá, is my way right?

I think I know the difference between allí and allá,

for example if I said my grandfather is buried there in a conversation but the graveyard is 30 miles it would be allí because its precise

Mi abuelo está enterrado allí.

and allá is unprecised

for example,

its beautiful over there in that town, and its 30 miles away too but its unprecise the area im talking about

Es muy bonita allá