Urselia is an ancient Gummi Bear city in the mountains which appeared in three episodes of the animated series Adventures of the Gummi Bears.
Ursalia was once homed to thousands of Gummi Bears until they had to abandon the city and escape from the jealous humans who would tried to steal their secrets. All of them except Sir Thornberry stayed behind to take care of the city.
The Gummis of Gummi Glen would all return to Ursalia to find the city repopulated by the Barbic Clan of Gummies.
After Gummi Glen was destroyed by the termite, it's possible that the Gummis of Gummi Glen moved to Ursalia.