To which region does the sales team that has used the WARE-MKL1006 warehouse the most times for its shipments belong?
"WARE-MKL1006" is the WarehouseCode; most shipment to region refers to Max(Count(Region))
SELECT T2.Region FROM `Sales Orders` AS T1 INNER JOIN `Sales Team` AS T2 ON T2.SalesTeamID = T1._SalesTeamID WHERE T1.WarehouseCode = 'WARE-MKL1006' GROUP BY T2.Region ORDER BY COUNT(T1.OrderNumber) DESC LIMIT 1