Which South African country is completely landlocked and entirely surrounded by South Africa?

1. Its economy is heavily reliant on remittances from workers employed in South Africa.
2. The country is a constitutional monarchy led by a king.
3. It's known for its beautiful mountain ranges and hiking trails, often referred to as the 'Kingdom in the Sky'.
4. Traditional blankets, called 'Basotho blankets', are a significant part of its cultural identity.