It is the distance between the parallels
The Drake Passage is between America and Antarctica.
that don't make sense
No.
Elba
All parallels of every latitude 23.5 degrees or less, both north and south.
The road parallels the river. She is investigating if there are any obvious parallels between the two cases.
Nothing.
Elba
The geography between Australia and Antarctica is the Southern Ocean geography.
Australia is the small continent in between the Antarctica and the equator
Parallels, as the name inplies, run parallel to each other in an east-west orientation. Meridians run through both poles, and so cannot be parallel.