Despite being regarded as one of the greatest role-playing games of all time, The Elder Scrolls III: Morrowind disappointed some fans upon its release in 2002 because it didn’t match the colossal scope of its predecessor, The Elder Scrolls II: Daggerfall. Almost immediately, fans began modding the remaining parts of the series’ fictional continent, Tamriel, into the game.

Over 20 years later, thousands of volunteers have collaborated on the mod projects Tamriel Rebuilt and Project Tamriel, building a space comparable in size to a small country. Such projects often sputter out, but these have endured, thanks in part to a steady stream of small, manageable updates instead of larger, less frequent ones.

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It’s true that Daggerfall included an entire continent’s worth of content, but it was mostly composed of procedurally generated liminal space. By contrast, Morrowind contained just a single island—not even the entire province after which the game was named. The difference was that it was handcrafted.

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“The entirety of Tamriel is, in our scale, roughly the size of the real-life country of Malta, which is small in real life, but quite big from a human perspective,” said Tiny Plesiosaur, a senior developer who has done mapping and planning for both projects but who spends most of her time on Project Tamriel these days.

Both projects aim to create a cohesive, lore-accurate representation of these realms as they would have looked during the fictional historical period in which Morrowind takes place. So far, they’ve made substantial progress.