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Kaer Morhen is an old keep where Witchers of the School of the Wolf used to be trained. Vesemir still resides in the keep, along with other Witchers who stop by from time to time. The name Kaer Morhen means Keep of the Elder Sea.
The main quest line will bring you to Kaer Morhen eventually. While you’re here you may want to explore the area to complete some of the secondary quests or do some treasure hunting. This is a high level area for Witchers level 23 and above.