In a large pitcher, stir together the limeade and water until well combined. Pour in mango nectar and stir once more.
Remove the ends from your limes, and then cut each lime into wheels (slice the whole lime). Add the lime wheels from 2 limes to the juice mixture, and save the rest to garnish your glasses.
Store pitcher in the fridge until ready to serve.
To serve:
Fill a rocks glass with ice, pour in Mango Libre, and garnish with a lime.
Notes
I found Goya brand mango nectar in the Mexican food section of my grocery store. You could use a mango juice blend in place of the nectar as well, you'll need about 2 1/2 cups juice.