Write SQL query to solve given problem: How many territories are there in the region with the highest number of territories?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T2.RegionDescription), T1.TerritoryDescription, COUNT(*) AS num FROM Territories AS T1 INNER JOIN Region AS T2 ON T1.RegionID = T2.RegionID GROUP BY T1.TerritoryDescription ORDER BY num DESC LIMIT 1