Question: The Letseng diamond mine, found in the landlocked Southern African kingdom of which country, a landlocked state or landlocked country is a sovereign state entirely enclosed by land, or whose only coastlines lie on closed seas?
Sentence (from "Letseng diamond mine"): The Letseng diamond mine, found in the landlocked Southern African kingdom of Lesotho, is owned by Gem Diamonds, Ltd. and the government of Lesotho, and at an elevation of 3,100 m (10,000 ft) it is the world's highest diamond mine.
Relevant evidence: Yes