Combined with the material 1, what are the geographical features of South Africa?

(1) The country (South Africa) is located at the southernmost tip of the mainland, bordering the Indian Ocean and the Atlantic Ocean on the east, west and south, and is a shipping hub between the two oceans.

(2) The terrain is mainly plateau, which belongs to tropical desert climate, with arid climate, extensive surface desert, few rivers and tropical desert (sparse vegetation).

(3) The terrain between the two swamps is relatively high; The recharge source of swamp is located in the tropical grassland climate zone; The large water supply in wet (rainy) season makes the swamp water level rise and gather; In dry (dry) season, the water supply is small and the evaporation is large, which leads to the decline and separation of swamp water level.