Known Space
There are several transport networks in Heaven's Wake which form the basis of the geography of the game. Regions of space and individual systems are usually terms by which network they belong to, rather than any physical location in real space, as systems connected by a network may be on the other side of the galaxy from each other. Each network is made up of Interstellar T-Gates which allow transport across the galaxy.
The Reconnect Network
The Reconnect Network, known merely as 'The Reconnect' is a series of systems, almost a hundred in total. The systems are not physically congruous and systems next to each other in the network, may be many hundreds of light years apart in real space. The Reconnect is a densely populated network, most of the systems are inhabited and is it continually expanding at a rate of a new system every few months.
At their heart is the 'origin' system, home of the 4th Jupiter Republic who are responsible for establishing the network. They discovered the keys to reactivating apex technology after a local posthuman complex was blasted open by a high speed comet. From the origin system their web of influence spreads through most systems of the Reconnect.
Some parts of the Reconnect are more peaceful than others, but wars involving more than a handful of systems are rare and most nations are too busy exploring and trading to wage large scale warfare against each other. Smaller conflicts are not uncommon however, often erupting over salvage or new colonies.
The Dark Roads
The Dark Roads are a separate Network of T-Gates to the Reconnect, various systems contain the T-Gates which allow access.
They are poorly understood sectors of space and fraught with dangers, natural, human or more esoteric. Some connections appear to be through some sort of mega-structure, it's dimensions are unknown, but spaceships can easily cross traverse it. Various routes have been mapped, some are even considered relatively safe and desperate traders or smugglers may use them to avoid attention or cut corners.
The Megastructure
Somewhere in the universe is a megastructure of such proportion that it is estimated to be at least the size of a small star. It's location is unknown, as the T-Gates within it are fully enclosed from space. It is a diverse maze of internal structures, some barely able to fit a starship, others seemingly able to fit small moons. Atmospheres are varied, some areas contain breathable atmospheres while other areas are hard vacuum. Whether it was built by the posthumans is unknown, but artifacts of posthuman technology has been found within it.