Official stuff is always on dnd.wizards.com, especially on their Faerûn page.
So there is Faerûn and in it we find the towns:
- Neverwinter (yes, the Neverwinter from Salvatore's Drizzt Books, Neverwinter Nights 1 & 2, the MMO and finally the MMO Neverwinter)
- Baldur's Gate (Yes, the one from the PC games BG, BG2, BG:DA, BG:DA2, the Clark & Athans novels)
- Icewind Dale (which again, has one and another PC game, and a Book trilogy).
- Waterdeep (from Eye of the Beholder and a novel)
But not yet the map... But wait! There is it! The official map in its very own article, a bit hidden! Here, ready for download! For FREE!
But wait, where's all the info? Oh, Do you want to know MORE! Is that map too tiny? Do you want it laminated and with more info? Run to your shop and get the Sword Coast Adventure Guide!
Wait, you need special maps for Storm King's Thunder? Why didn't you say you in the beginning? HERE! The official one for this module, with a MAP on the inside! You're missing the module yet? missing what it is about? Wizards can help! Really? You want me to tell? In short: ... it's a D&D Module! Yes, yes, I know, I am evil, but I do no spoilers!
Year and day later...
Apparently Mike Schley, the artist of the Tomb of Annihilation, ALSO provides maps for the forgotten realms in an official function (as prints & downloads) via his own website. On that page, you surely will find the Faerûn sub page, but I am nice and link it.