New Devon is a multiplayer map in Uncharted 4: A Thief's End. It's the second map to be released after the Patch 1.08 (AKA: The Lost Treasures DLC) update. It is based on the ruins of New Devon the city that was founded by Henry Avery and the pirates of Libertalia. 
"Inspired by the Uncharted 4 campaign, New Devon is set in the lush ruins of an abandoned pirate colony. It’s one of our largest maps to-date and features wide open exteriors with elevated vantages for those who prefer long-range engagements. If you’re more of a run-and-gun player, don’t worry — there’s no shortage of tight corridors for close-quarters combat."