Which landlocked country, heavily reliant on South African ports, is named after a Bantu ethnic group and known for its unique emaSwati culture?

1. Its currency is pegged to the South African Rand.
2. King Mswati III is its head of state.
3. It's home to one of the oldest mines in the world, dating back 43,000 years.
4. It is smaller in land area than Lesotho.