Belasitsa (Belles) Mountain is a part of Lake Kerkini National Park which is situated in the north-west part of Serres Prefecture. The mountain is a natural border between Greece, Bulgaria and FYROM. On the south and south-west there are the mountains Disoro and Maurovouni (Krousia) with an altitude of 1179 m. The south and south-east border of the National Park is set by the road Lithotopos-Strymonochori and on the east and north-east - by the river Bistritsa and the road that leads to the village of Agistro.
The geographic coordinates of the core of the National Park in different systems are:
Table 1: Geographic coordinates of the core of Lake Kerkini National Park
| Reference System | Latitude | Longitude |
|---|---|---|
| Hellenic Geodetic Reference System 1987 | 23ο 13’34’’8847 | 41ο 18’38’’02356 |
| GIS (ED50 Greece) | 23ο 13’43’’57682 | 41ο 18’50’’60787 |
| Bessel | -0ο 29’24’’75999 | 41ο 18’45’’03988 |
| WGS 84 | 23ο 13’41’’19568 | 41ο 18’47’’31620 |
