All the main locations are marked on the map such as all the clusters / nebulas.
You will learn which planetary systems are included in each of them.
Mass Effect 3 - Galaxy map
Marked on the map:
1.
Serpent Nebula [systems: Widow]
2.
Silean Nebula [systems: Kypladon, Loropi, Nahuala, Phontes, Teyolia]
3.
Athena Nebula [systems: Ialessa, Orisoni, Parnitha, Tomaros, Vernio]
4.
Nimbus Cluster [systems: Agaiou, Kallini, Mesana, Pelion]
5.
Minos Wasteland [systems: Arrae, Fortis]
6.
Ismar Frontier [systems: Aquila, Elysta, Faia]
7.
The Shrike Abyssal [systems: Urla Rast, Xe Cha]
8.
Hourglass Nebula [systems: Faryar, Osun, Ploitari, Sowilo]
9.
Valhallan Threshold [systems: Micah, Paz, Raheel-Leyya]
10.
Sigurd’s Cradle [systems: Decoris, Skepsis]
11.
Ninmah Cluster [systems: Maskim Xul, Mulla Xul]
12.
Kepler Verge [systems: Newton]
13.
Hades Nexus [systems: Hekate, Hoplos, Pamiat', Sheol]
14.
Shadow Sea [systems: Iera]
15.
Nubian Expanse [systems: Dakka, Kalabsha, Qertassi]
16.
Argos Rho [systems: Phoenix, Gorgon, Hydra]
17.
Gemini Sigma [systems: Han, Ming]
18.
Attican Beta[systems: Hercules, Theseus]
19.
Hades Gamma [systems: Antaeus, Cacus, Dis, Farinata, Plutus]
20.
Horse Head Nebula [systems: Anadius, Pax]
21.
Arcturus Stream [systems: Arkturus, Euler]
22.
Exodus Cluster [systems: Asgard, Utopia]
23.
Kite’s Nest [systems: Harsa, Untrel, Vular]
24.
Krogan DMZ [systems: Aralakh Dranek, Nith]
25.
Annos Basin [systems: Pranas]
26.
Apien Crest [systems: Castellus, Gemmae, Trebia]
27.
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