Ezra Bridger defeated Grand Admiral Thrawn, sending them both deep into the Unknown Regions using a pod of space whales known as purrgil.

Source: https://screenrant.com/star-wars-rebels-hera-syndulla-essential-rebels-episodes/

However, the purrgil can hop to and from around the cosmos without such technological assistance.

Source: https://www.cbr.com/ahsoka-purrgil-more-powerful-than-expected/

Jedi Padawan Ezra Bridger summoned a flock of purrgil, ' space whales, to pull Thrawn's flagship away into hyperspace.

Source: https://screenrant.com/star-wars-pathway-to-peridea-explained/

The location of Ezra Bridger has been unknown since he was pulled into hyperspace with Thrawn by purrgil in the series finale.

Source: https://screenrant.com/ezra-bridger-star-wars-secret-future/

The purrgil are able to travel through hyperspace, a separate dimension that enables faster travel.

Source: https://screenrant.com/ahsoka-episode-5-how-space-whales-purrgil-travel-find-sabine/