From the booklet's introduction:
Beyond consists of 16 subsectors with a total of 463 worlds. the total population as of 335-1042 was 561 billion sentients, distributed as follows: 493.7 billion Humaniti (including less than 10 thousand Zhodani and 35.5 billion Mal'Gnar); 37.8 billion Aslan; 29.5 billion Sred^Ni and 967 thousand Droyne.
Beyond is considered by some astrographers to be part of the Out-Rim Void, a relatively uncharted area concentrated in the spnward part of the adjacent trailing sector.
The data booklet also comes with a 40cm x 28cm black and white map of the sector.