This page contains detailed maps of every open world in Mass Effect, with three maps per world.
Initial maps are simply screenshots of the in-game map directly after landing.
Details maps call things out that are not necessarily obvious while playing the game:
All anomalies and minerals are presented upfront.
Thresher Maws are marked using an obvious red icon.
Other items of interest not otherwise marked are called out using a yellow X, whether they be loot (inventory) or enemies (XP).
Completed maps are simply screenshots of the in-game map when everything there has been finished. Remember, though, that not everything is reflected here which is why the Details maps have been created.