Which World of Warcraft expansion introduced the continents Kul Tiras and Zandalar?

The World of Warcraft expansion that introduced Kul Tiras and Zandalar was Battle for Azeroth.

Battle for Azeroth, the game’s seventh expansion, was released on August 14, 2018. Its central conflict returned to the long-running rivalry between the Alliance and Horde after the events of Legion. To gain strategic allies, the Alliance traveled to Kul Tiras, a major human maritime kingdom, while the Horde sought support from Zandalar, the ancient homeland of Azeroth’s trolls.

Each continent offered three principal zones. Kul Tiras included Tiragarde Sound, Drustvar and Stormsong Valley, with Boralus as the Alliance capital. Zandalar included Zuldazar, Nazmir and Vol’dun, with Dazar’alor serving as the Horde capital. Although factions initially began on separate continents, both became accessible as the expansion progressed.

A common mix-up is confusing the continents with later story locations such as Nazjatar, which arrived in a subsequent patch and is an underwater region. Battle for Azeroth also raised the level cap from 110 to 120 and added features including Island Expeditions, Warfronts and the Heart of Azeroth.