How many miles is the border of Georgia?

it depends on whether you mean how many miles away or how many miles long
&
if you mean how many miles away then it also depends on where you are


but since i don't know where you are i will assume you don't mean how many miles away but rather how many miles long


even so
it also depends on which of the several borders of Georgia you mean
& it may depend further on the length of your measuring unit

but if you mean how long are any of the several borders of Georgia
or all of them added together
& your measuring unit is human sized rather than microscopic or gigantic
then
Florida about 261 miles on land & 4 miles at sea
Alabama about 291 miles entirely on land
Tennessee about 73 miles entirely on land
South Carolina about 250 miles on land & 4 miles at sea
& the territorial sea border with the united states about 103 miles


so all the 4 land borders or state lines of Georgia total about 875 miles
& all the 3 sea borders total about 111 miles
& the entire border perimeter on land & sea combined totals about 986 miles