Write SQL query to solve given problem: Which nations have a boundary with the Kalahari Desert?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T3.Name FROM desert AS T1 INNER JOIN geo_desert AS T2 ON T1.Name = T2.Desert INNER JOIN country AS T3 ON T3.Code = T2.Country WHERE T1.Name = 'Kalahari'