Here is a map of the South-East part of Iceland with the places described on the page marked by red dot.
Distance from Reykjavik to following places is:
Vík: 190 km - Kirkjubæjarklaustur: 260 km - Skaftafell: 330 km - Jökulsárlón: 400 km - Höfn: 475 km - Djúpivogur: 570 km.